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Document And Entity Information - USD ($)	12 Months Ended
Document And Entity Information - USD ($)	Dec. 31, 2013	Feb. 21, 2014	Jun. 28, 2013
Document and Entity Information [Abstract]
Entity Registrant Name	ICF International, Inc.
Document Type	10-K
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		19,771,147
Entity Public Float			$ 606,000,000
Amendment Flag	false
Entity Central Index Key	0001362004
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Well-known Seasoned Issuer	No
Document Period End Date	Dec. 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	FY

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2013	Dec. 31, 2012
Current Assets
Cash	$ 8,953	$ 14,725
Contract receivables, net	205,062	204,938
Prepaid expenses and other	7,847	7,608
Income tax receivable	4,482	11,231
Total current assets	226,344	238,502
Total property and equipment, net	30,214	28,860
Other assets:
Goodwill	418,839	410,583
Other intangible assets, net	12,239	21,016
Restricted cash	1,864	2,015
Other assets	11,414	8,745
Total Assets	700,914	709,721
Current Liabilities
Accounts payable	45,544	44,665
Accrued salaries and benefits	45,994	42,264
Accrued expenses	32,256	31,779
Deferred revenue	20,282	22,333
Deferred income taxes	6,144	5,790
Total Current Liabilities	150,220	146,831
Long-term Liabilities:
Long-term debt	40,000	105,000
Deferred rent	12,912	10,599
Deferred income taxes	10,780	9,081
Other	12,911	9,460
Total Liabilities	226,823	280,971
Commitments and Contingencies
Stockholders’ Equity
Preferred stock, par value $.001 per share; 5,000,000 shares authorized; none issued
Common stock, $.001 par value; 70,000,000 shares authorized; 20,617,270 and 20,171,613 shares issued; and 19,764,634 and 19,559,409 shares outstanding as of December 31, 2013, and December 31, 2012, respectively	21	20
Additional paid-in capital	250,698	237,262
Retained earnings	245,907	206,577
Treasury stock	(21,545)	(13,868)
Accumulated other comprehensive loss	(990)	(1,241)
Total Stockholders’ Equity	474,091	428,750
Total Liabilities and Stockholders’ Equity	$ 700,914	$ 709,721

Consolidated Balance Sheets (Parentheticals) - $ / shares	Dec. 31, 2013	Dec. 31, 2012
Preferred stock par value (in Dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Common stock, par value (in Dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	70,000,000	70,000,000
Common stock, shares issued	20,617,270	20,171,613
Common stock, shares outstanding	19,764,634	19,559,409

Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Gross Revenue	$ 949,303	$ 937,133	$ 840,775
Direct Costs	591,516	583,195	520,522
Operating costs and expenses
Indirect and selling expenses	272,387	263,878	240,964
Depreciation and amortization	11,238	9,789	10,258
Amortization of intangible assets	9,477	14,089	9,550
Total operating costs and expenses	293,102	287,756	260,772
Operating Income	64,685	66,182	59,481
Interest expense	(2,447)	(3,946)	(2,747)
Other (expense) income	(12)	(325)	26
Income Before Income Taxes	62,226	61,911	56,760
Provision for Income Taxes	22,896	23,836	21,895
Net Income	$ 39,330	$ 38,075	$ 34,865
Earnings per Share:
Basic (in Dollars per share)	$ 1.99	$ 1.94	$ 1.77
Diluted (in Dollars per share)	$ 1.95	$ 1.91	$ 1.75
Weighted-average Common Shares Outstanding:
Basic (in Shares)	19,755	19,663	19,684
Diluted (in Shares)	20,186	19,957	19,928
Other comprehensive income:
Foreign currency translation adjustments	$ 251	$ (436)	$ (281)
Comprehensive income	$ 39,581	$ 37,639	$ 34,584

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at Dec. 31, 2010	$ 20	$ 220,891	$ 133,637	$ (1,291)	$ (524)	$ 352,733
Balance (in Shares) at Dec. 31, 2010	19,568			51
Net income			34,865			34,865
Other comprehensive loss					(281)	(281)
Equity compensation		6,658				6,658
Exercise of stock options		478				478
Exercise of stock options (in Shares)	39
Issuance of shares pursuant to vesting of restricted stock units (in Shares)	176
Net payments for stock issuances and buybacks		77		$ (975)		(898)
Net payments for stock issuances and buybacks (in Shares)	9			44
Tax impact of stock option exercises and award vesting		(527)				(527)
Balance at Dec. 31, 2011	$ 20	227,577	168,502	$ (2,266)	(805)	393,028
Balance (in Shares) at Dec. 31, 2011	19,792			95
Net income			38,075			38,075
Other comprehensive loss					(436)	(436)
Equity compensation		8,770				8,770
Exercise of stock options		78				78
Exercise of stock options (in Shares)	11
Issuance of shares pursuant to vesting of restricted stock units (in Shares)	231
Net payments for stock issuances and buybacks		33		$ (11,602)		(11,569)
Net payments for stock issuances and buybacks (in Shares)	(475)			517
Tax impact of stock option exercises and award vesting		804				804
Balance at Dec. 31, 2012	$ 20	237,262	206,577	$ (13,868)	(1,241)	428,750
Balance (in Shares) at Dec. 31, 2012	19,559			612
Net income			39,330			39,330
Other comprehensive loss					251	251
Equity compensation		8,786		$ 105		8,891
Exercise of stock options	$ 1	3,102				3,103
Exercise of stock options (in Shares)	159
Issuance of shares pursuant to vesting of restricted stock units (in Shares)	294			(5)
Net payments for stock issuances and buybacks		335		$ (7,782)		(7,447)
Net payments for stock issuances and buybacks (in Shares)	(247)			246
Tax impact of stock option exercises and award vesting		1,213				1,213
Balance at Dec. 31, 2013	$ 21	$ 250,698	$ 245,907	$ (21,545)	$ (990)	$ 474,091
Balance (in Shares) at Dec. 31, 2013	19,765			853

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash Flows from Operating Activities
Net income	$ 39,330	$ 38,075	$ 34,865
Adjustments to reconcile net income to net cash provided by operating activities:
Bad debt expense (recovery)	112	336	(64)
Deferred income taxes	2,434	13,637	(4,623)
(Gain) loss on disposal of fixed assets	(15)	122	(13)
Non-cash equity compensation	8,891	8,770	6,658
Depreciation and amortization	20,715	23,878	19,808
Amortization of debt issue costs	476	562	499
Deferred rent	2,606	3,594	2,235
Changes in operating assets and liabilities, net of the effect of acquisitions:
Contract receivables	829	12,457	(18,147)
Prepaid expenses and other assets	(3,619)	(162)	(1,043)
Accounts payable	730	2,604	7,996
Accrued salaries and benefits	3,699	(4,154)	4,703
Accrued expenses	42	1,619	2,822
Deferred revenue	(2,706)	(2,638)	(692)
Income tax receivable and payable	6,749	(10,451)	466
Restricted cash	150	(807)	1,971
Other liabilities	609	(201)	2,080
Net Cash Provided by Operating Activities	81,032	87,241	59,521
Cash Flows from Investing Activities
Capital expenditures for property and equipment and capitalized software	(14,161)	(13,561)	(10,234)
Payments for business acquisitions, net of cash received	(4,763)	(9,974)	(108,009)
Net Cash Used in Investing Activities	(18,924)	(23,535)	(118,243)
Cash Flows from Financing Activities
Advances from working capital facilities	139,215	172,270	213,138
Payments on working capital facilities	(204,215)	(212,270)	(153,138)
Debt issue costs		(1,955)	(8)
Proceeds from exercise of options	3,103	78	478
Tax benefits of stock option exercises and award vesting	1,213	804	227
Net payments for stockholder issuances and buybacks	(7,447)	(11,569)	(898)
Net Cash (Used in) Provided by Financing Activities	(68,131)	(52,642)	59,799
Effect of Exchange Rate Changes on Cash	251	(436)	(281)
(Decrease) Increase in Cash	(5,772)	10,628	796
Cash, beginning of period	14,725	4,097	3,301
Cash, end of period	8,953	14,725	4,097
Cash paid during the period for:
Interest	2,459	3,243	2,334
Income taxes	13,670	$ 20,377	$ 26,411
Non-cash investing and financing transactions:
Fair value of contingent consideration payable in connection with acquisition	$ 2,842

Note A - Basis of Presentation and Nature of Operations

12 Months Ended

Dec. 31, 2013

Disclosure Text Block [Abstract]

Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]

NOTE A—BASIS OF PRESENTATION AND NATURE OF OPERATIONS

Basis of Presentation and Nature of Operations

The accompanying consolidated financial statements include the accounts of ICF International, Inc. (“ICFI”), and its subsidiary, ICF Consulting Group, Inc. (“Consulting,” and together with ICFI, “the Company”). Consulting is a wholly owned subsidiary of ICFI. ICFI is a holding company with no operations or assets other than its investment in the common stock of Consulting. All other subsidiaries of the Company are wholly owned by Consulting. All significant intercompany transactions and balances have been eliminated.

Nature of Operations

The Company provides management, technology, and policy professional services in the areas of energy, environment, and infrastructure; health, social programs, and consumer/financial; and public safety and defense. The Company’s major clients are U.S. federal government departments and agencies, most significantly Department of Health and Human Services (“HHS”), Department of Justice and Department of State. We also serve U.S. state and local government departments and agencies; non-governmental organizations, non-U.S. governments, and multilateral institutions; and commercial clients worldwide, such as airlines, airports, electric and gas utilities, financial institutions, health payer and provider organizations, law firms, multinational corporations, non-profit organizations, oil companies, and retail firms. The Company offers a full range of services to these clients, including strategy, analysis, program management, and information technology solutions that combine experienced professional staff, industry and institutional knowledge, and analytical methods.

The Company, incorporated in Delaware, is headquartered in Fairfax, Virginia. It maintains offices throughout the world, including over 50 offices in the U.S. and over 15 offices in key markets outside the U.S., including offices in Beijing, Hong Kong, New Delhi, Ottawa, Toronto, Brussels, London, and Rio de Janeiro.

Reclassifications

Certain amounts in the 2012 and 2011 consolidated financial statements have been reclassified to conform to the current year presentation.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

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+ Details

Note B - Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Significant Accounting Policies [Text Block]

NOTE B—SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Revenue Recognition

The Company recognizes revenue when persuasive evidence of an arrangement exists, services have been rendered, the contract price is fixed or determinable, and collectability is reasonably assured. The Company enters into three types of contracts: time-and-materials, cost-based, and fixed-price.

	•	Time-and-Materials Contracts. Revenue for time-and-materials contracts is recorded on the basis of allowable labor hours worked multiplied by the contract-defined billing rates, plus the costs of other items used in the performance of the contract. Profits and losses on time-and-materials contracts result from the difference between the cost of services performed and the contract-defined billing rates for these services.

	•	Cost-Based Contracts. Revenue under cost-based contracts is recognized as costs are incurred. Applicable estimated profit, if any, is included in earnings in the proportion that incurred costs bear to total estimated costs. Incentives, award fees, or penalties related to performance are also considered in estimating revenue and profit rates based on actual and anticipated awards, based on factors such as the Company’s prior award experience and communications with the customer regarding performance.

	•	Fixed-Price Contracts. Revenue for fixed-price contracts is recognized when earned, generally as work is performed. Services performed vary from contract to contract and are not always uniformly performed over the term of the arrangement. We recognize revenue in a number of different ways on fixed-price contracts, including:

•

Proportional Performance: Revenue on certain fixed-price contracts is recorded each period based upon certain contract performance measures (labor hours, labor costs, or total costs) incurred expressed as a proportion of a total project estimate. Thus, labor hours, labor costs, or total contract costs incurred to date are compared with the total estimate for these items at completion. Performance is based on the ratio of the incurred hours or costs to the total estimate. Progress on a contract is monitored regularly to ensure that revenue recognized reflects project status. When hours or costs incurred are used as the basis for revenue recognition, the hours or costs incurred represent a reasonable surrogate for output measures of contract performance, including the presentation of deliverables to the client. Clients are obligated to pay as services are performed, and in the event that a client cancels the contract, payment for services performed through the date of cancellation is negotiated with the client.

	•	Contractual Outputs: Revenue on certain fixed-price contracts is recognized based upon outputs completed to date expressed as a percentage of total outputs required in the contract or based upon units delivered to the customer multiplied by the contract-defined unit price.

	•	Straight-Line: When services are performed or are expected to be performed consistently throughout an arrangement, revenue on those fixed-price contracts is recognized ratably over the period benefited.

	•	Completed Contract: Revenue and costs on certain fixed-price contracts are recognized at completion if the final act is so significant to the arrangement that value is deemed to be transferred only at completion.

Revenue recognition requires the Company to use judgment relative to assessing risks, estimating contract revenue and costs or other variables, and making assumptions for scheduling and technical issues. Due to the size and nature of many of its contracts, the estimation of revenue and estimates at completion can be complicated and are subject to many variables. Contract costs include labor, subcontracting costs, and other direct costs, as well as an allocation of allowable indirect costs. The Company must also make assumptions regarding the length of time to complete the contract because costs include expected increases in wages, prices for subcontractors, and other direct costs. From time to time, facts develop that require it to revise its estimated total costs or hours and thus the associated revenue on a contract. To the extent that a revised estimate affects contract profit or revenue previously recognized, the Company records the cumulative effect of the revision in the period in which the facts requiring the revision become known. Provision for the full amount of an anticipated loss on any type of contract is recognized in the period in which it becomes probable and can be reasonably estimated. As a result, operating results could be affected by revisions to prior accounting estimates.

The approximate percentage of revenue by contract type was as follows:

	Year ended December 31,
	2013			2012			2011
Time-and-materials		52	%		49	%		49	%
Fixed-price		29	%		30	%		28	%
Cost-based		19	%		21	%		23	%
Total		100	%		100	%		100	%

Payments to the Company on cost-based contracts with the U.S. government are provisional payments subject to adjustment upon audit by the government. Such audits have been finalized through December 31, 2006, and any adjustments have been immaterial. Contract revenue for subsequent periods has been recorded in amounts that are expected to be realized upon final audit and settlement of costs in those years.

The Company generates invoices to clients in accordance with the terms of the applicable contract, which may not be directly related to the performance of services. Unbilled receivables are invoiced based upon the achievement of specific events as defined by each contract, including deliverables, timetables, and incurrence of certain costs. Unbilled receivables are classified as a current asset. Advanced billings to clients in excess of revenue earned are recorded as deferred revenue until the revenue recognition criteria are met. Reimbursements of out-of-pocket expenses are included in revenue with corresponding costs incurred by us included in the cost of revenue.

The Company may proceed with work based upon written client direction prior to the completion and signing of formal contract documents. It has a formal review process for approving any such work. Revenue associated with such work is recognized only when it can reliably be estimated and realization is probable. The Company bases its estimates on a variety of factors, including previous experiences with the client, communications with the client regarding funding status, and its knowledge of available funding for the contract.

Approximately 58%, 60%, and 66% of the Company’s revenue for the years 2013, 2012, and 2011, respectively, were derived under prime contracts and subcontracts with agencies and departments of the U.S. federal government. For the years ending December 31, 2013, 2012, and 2011, our largest client was HHS, the various branches of which accounted for approximately 18% or $173.7 million, 19% or $180.1 million, and 22% or $184.5 million, respectively, of the Company’s revenue. The accounts receivable due from HHS contracts as of December 31, 2013 and 2012 were approximately $11.8 million and $21.3 million, respectively.

Cash and Cash Equivalents

The Company considers cash on deposit and all highly liquid investments with original maturities of three months or less to be cash and cash equivalents.

Allowance for Doubtful Accounts

The Company considers a number of factors in its estimate of allowance for doubtful accounts, including the customer’s financial condition, historical collection experience, and other factors that may bear on collectability of the receivables. The Company writes off contract receivables when such amounts are determined to be uncollectible. Losses have historically been within management’s expectations.

Property and Equipment

Property and equipment are carried at cost and are depreciated using the straight-line method over their estimated useful lives, which range from two to seven years. Leasehold improvements are amortized on a straight-line basis over the shorter of the economic life of the improvement or the related lease term. Assets acquired in acquisitions are recorded at fair value.

The Company is required to review long-lived assets and identifiable intangibles subject to amortization for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset might not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to future undiscounted net cash flows expected to be generated by the asset. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the asset exceeds its fair value. Assets to be disposed of are reported at the lower of the carrying amount or fair value, less cost to sell.

Goodwill and Other Intangible Assets

Goodwill represents the excess of costs over fair value of assets of businesses acquired. Goodwill and intangible assets acquired in a business combination and determined to have an indefinite useful life are not amortized, but instead reviewed for impairment annually, or more frequently if impairment indicators arise. Intangible assets with estimable useful lives must be amortized over such lives and reviewed for impairment.

The Company performs its annual goodwill impairment review as of September 30 of each year. For the purposes of performing this review, the Company has concluded that it is one reporting unit. For the annual impairment review as of September 30, 2013, the Company opted to perform a qualitative assessment of whether it is more likely than not that our reporting unit's fair value is less than its carrying amount. If, after completing its qualitative assessment, the Company determines that it is not more likely than not that the carrying value exceeds the estimated fair value, it may conclude that no impairment exists. If the Company concludes otherwise, a two-step goodwill impairment test must be performed which includes a comparison of the fair value of the reporting unit to the carrying value. When required, the Company estimates the fair value of its one reporting unit using a market-based approach, which includes certain premiums. The Company conducts a market comparison in which it assesses implied control premiums paid in excess of market price in acquisitions of publicly-traded companies occurring within the past six years of its review. In its comparison, the Company takes into consideration the market, industry, geographic location, and other relevant information of such companies in order to identify companies similar to it. The implied control premiums for each of the acquisitions are calculated by comparing the per share prices one month prior to the transaction to the per share purchase price. Based on analysis of the arithmetic mean of the implied control premium for various time frames within the six-year period, we select an appropriate control premium based on these factors and apply it to our market capitalization as of the impairment test date. The Company views premiums paid in excess of market price to be derived from potential synergies and benefits gained as a result of the acquisition and, accordingly, the Company believes the inclusion of these premiums in its determination of fair value is appropriate. If the estimated fair value of the reporting unit is less than the carrying value, a second calculation is required to measure the amount of goodwill impairment loss to be recognized for that reporting unit, if any.

The Company’s qualitative analysis as of September 30, 2013 included macroeconomic and industry and market specific considerations, financial performance indicators and measurements, and other factors. Based on the Company’s qualitative assessment, it determined that it is not more likely than not that the fair value of its one reporting unit is less than its carrying amount, and thus the two-step impairment test is not required to be performed for 2013. Therefore, based upon management’s review, no goodwill impairment charge was required as of September 30, 2013. Historically, the Company has recorded no goodwill impairment charges.

The Company is required to review long-lived assets and certain identifiable intangibles for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset might not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to future undiscounted net cash flows expected to be generated by the asset. If such assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the asset exceeds its fair value. Assets to be disposed of are reported at the lower of the carrying amount or fair value, less cost to sell.

Capitalized Software

The Company capitalizes eligible costs to develop enhancements and upgrades to internal-use software that are incurred subsequent to the preliminary project stage. Amortization expense is recorded on a straight-line basis over the expected economic life, typically five years. Capitalized software development costs of $1.6 million and $1.5 million are included in other assets for the years ended December 31, 2013 and 2012, respectively. Amortization expense for each of 2013, 2012 and 2011 was $0.3 million.

Stock-based Compensation

The Company recognizes stock-based compensation expense related to share-based payments to employees, including grants of employee stock options, restricted stock awards, restricted stock units (“RSUs”) and cash-settled restricted stock units (“CSRSUs”), on a straight-line basis over the requisite service period, which is generally the vesting period. Compensation expense is based on the estimated fair value of these instruments and the estimated number of shares we ultimately expect will vest. The fair value of stock options, restricted stock awards and restricted stock units is estimated based on the fair value of a share of common stock at the grant date. The Company has elected to use the Black-Scholes-Merton option pricing model to determine the fair value of stock options.

In 2013, the Company began to utilize CSRSUs as a form of compensation that is settled only in cash payments. The cash payment is based on the fair value of the Company’s stock price at the vesting date, calculated by multiplying the number of CSRSUs vested by the Company’s closing stock price on the vesting date. The payment is subject to a maximum payment cap and a minimum payment floor. The Company treats these awards as liability-classified awards, and therefore accounts for them at fair value estimated based on the closing price of the Company’s stock at the reporting date.

Foreign Currency Translation

The financial positions and results of operations of the Company’s foreign subsidiaries are based on the local currency as the functional currency and are translated to U.S. dollars for financial reporting purposes. Assets and liabilities of the subsidiaries are translated at the exchange rate in effect at year-end. Income statement accounts are translated at the average rate of exchange prevailing during the year. Translation adjustments arising from the use of differing exchange rates from period to period are included in accumulated other comprehensive income (loss) in stockholders’ equity. Gains and losses resulting from foreign currency transactions included in operations are not material for any of the periods presented.

Deferred Rent

The Company recognizes rent expense on a straight-line basis over the term of each lease. Lease incentives or abatements received at or near the inception of leases are accrued and amortized ratably over the life of the lease.

Fair Value of Financial Instruments

The Company's financial instruments, including cash and cash equivalents, accounts receivable, accounts payable and accrued expenses, and other current liabilities, are carried at cost, which the Company believes approximates their fair values at December 31, 2013, due to their short maturities. The Company believes the carrying value of its lines of credit payable approximate the estimated fair value for debt with similar terms, interest rates, and remaining maturities currently available to companies with similar credit ratings at December 31, 2013. The Company applies the provisions of ASC 820, Fair Value Measurements and Disclosures (“ASC 820,”) to its assets and liabilities that are required to be measured at fair value pursuant to other accounting standards, including contingent liabilities related to acquisitions and one foreign currency forward contract agreement not eligible for hedge accounting. The impact of the hedge to the consolidated financial statements was immaterial. The additional fair value disclosures are included in “Note L—Fair Value Measurement.”

Income Taxes

The Company recognizes deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates in effect for the year in which those temporary differences are expected to be recovered or settled. The Company evaluates its ability to benefit from all deferred tax assets and establishes valuation allowances for amounts it believes are not more likely than not to be realizable. For uncertain tax positions, the Company uses a more-likely-than-not recognition threshold based on the technical merits of the income tax position taken. Income tax positions that meet the more-likely-than-not recognition threshold are measured in order to determine the tax benefit recognized in the financial statements. Penalties, if probable and reasonably estimable, and interest expense related to uncertain tax positions are not recognized as a component of income tax expense but recorded separately in indirect expenses.

Treasury Shares

Treasury shares are accounted for under the cost method.

Segment

The Company has concluded that it operates in one segment based upon the information used by its chief operating decision maker in evaluating the performance of its business and allocating resources. This single segment represents the Company’s core business, professional services for government and commercial clients. Although the Company describes multiple service offerings to three markets to provide a better understanding of the Company’s business operations, the Company does not manage its business or allocate resources based upon those service offerings or markets.

Risks and Uncertainties

Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash and cash equivalents and contract receivables. The majority of the Company’s cash transactions are processed through one U.S. commercial bank. Cash in excess of daily requirements is used to reduce any amounts outstanding under the Company’s Credit Facility or invested in overnight investment sweeps. As of December 31, 2013 and 2012, the Company held approximately $5.3 million and $7.3 million, respectively, of cash in foreign financial institutions. To date, the Company has not incurred losses related to cash and cash equivalents.

The Company’s contract receivables consist principally of contract receivables from agencies and departments of, as well as from prime contractors to, the federal government, other governments, and commercial organizations. The Company believes that this credit risk, with respect to contract receivables, is limited due to the credit worthiness of the U.S. government. The Company extends credit in the normal course of operations and does not require collateral from its clients.

The Company has historically been, and continues to be, heavily dependent upon contracts with the federal government and is subject to audit by agencies of the federal government. Such audits determine, among other things, whether an adjustment of invoices rendered to the government is appropriate under the underlying terms of the contracts. Management does not expect any significant adjustments as a result of government audits that will adversely affect the Company’s financial position.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, and contingent liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting periods. Actual results could differ from those estimates.

Note C - Contract Receivables

12 Months Ended

Dec. 31, 2013

Receivables [Abstract]

Loans, Notes, Trade and Other Receivables Disclosure [Text Block]

NOTE C—CONTRACT RECEIVABLES

Contract receivables consisted of the following at December 31:

	2013			2012
Billed	$	102,995		$	133,014
Unbilled		96,243			66,814
Retainages		3,914			3,654
Other		3,663			2,904
Allowance for doubtful accounts		(1,753	)		(1,448	)
Contract receivables, net	$	205,062		$	204,938

Contract receivables, net of the established allowance, are stated at amounts expected to be realized in future periods. Unbilled receivables result from revenue that has been earned in advance of billing. Unbilled receivables can be invoiced at contractually defined intervals or milestones, as well as upon completion of the contract or government audits. The decrease in billed receivables and the increase in unbilled receivables are primarily due to fewer days in the related billing cycles at December 31, 2013 compared to December 31, 2012. The Company anticipates that the majority of unbilled receivables will be substantially billed and collected within one year, and therefore, classifies them as current assets in accordance with industry practice.

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References + Details

Note D - Property and Equipment

12 Months Ended

Dec. 31, 2013

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment Disclosure [Text Block]

D—PROPERTY AND EQUIPMENT

Property and equipment consisted of the following at December 31:

	2013			2012
Leasehold improvements	$	9,224		$	6,379
Software		27,677			24,948
Furniture and equipment		17,127			15,174
Computers		25,415			23,466
		79,443			69,967
Accumulated depreciation and amortization		(49,229	)		(41,107	)
Total property and equipment, net	$	30,214		$	28,860

Depreciation expense for property and equipment for the years ended December 31, 2013, 2012, and 2011, was approximately $11.2 million, $9.8 million, and $10.3 million, respectively.

Note E - Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets Disclosure [Text Block]

NOTE E—GOODWILL AND OTHER INTANGIBLE ASSETS

Goodwill

The changes in the carrying amount of goodwill for the fiscal years ended December 31 were as follows:

	2013			2012
Balance as of January 1	$	410,583		$	401,134
Goodwill resulting from the Ironworks business combination		—			119
Goodwill resulting from the GHK business combination		(101	)		7,857
Goodwill resulting from the Symbiotic Engineering business combination		—			1,473
Goodwill resulting from the ECA business combination		8,357			—
Balance as of December 31	$	418,839		$	410,583

Other Intangible Assets

Intangible assets are primarily amortized over periods ranging from approximately 1 to 10 years. The weighted-average period of amortization for all intangible assets as of December 31, 2013, is 7.4 years. The customer-related intangible assets related to the business combinations, which consist of customer contracts, backlog, and non-contractual customer relationships, are being amortized based on estimated cash flows and respective estimated economic benefit of the assets. The weighted-average period of amortization of the customer-related intangibles is 7.4 years. Intangible assets related to acquired developed technology are being amortized on an accelerated basis over a weighted-average period of 4.8 years. Other intangibles consisted of the following at December 31:

	2013			2012
Customer-related intangibles	$	58,829		$	58,204
Developed technology		960			3,237
Marketing trade name		—			814
		59,789			62,255
Less: accumulated amortization		(47,550	)		(41,239	)
Total other intangible assets, net	$	12,239		$	21,016

Aggregate amortization expense for the years ended December 31, 2013, 2012, and 2011, was approximately $9.5 million, $14.1 million, and $9.6 million, respectively. The estimated future amortization expense relating to intangible assets is as follows:

Year ending December 31,
2014	$	5,737
2015		3,012
2016		1,719
2017		1,024
2018		519
Thereafter		228
	$	12,239

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Note F - Business Combinations

12 Months Ended

Dec. 31, 2013

Business Combinations [Abstract]

Business Combination Disclosure [Text Block]

NOTE F—BUSINESS COMBINATIONS

ECA

In July 2013, the Company hired the staff of, and purchased certain assets and liabilities from, ECA, an e-commerce technology services firm based in New York, New York. In connection with the acquisition, the Company recorded a contingent consideration payable reflected in other long-term liabilities. The purchase was immaterial to the Company’s financial statements taken as a whole. The addition of ECA enhanced ICF’s multi-channel, end-to-end e-commerce solutions.

Symbiotic

In September 2012, the Company hired the staff and purchased certain assets from Symbiotic, a company based in Boulder, Colorado. The purchase was immaterial to the Company’s financial statements taken as a whole. The purchase included the Sustainability Information System (“SIMS”) platform, which brought the Company new opportunities to provide utility clients information and analyses for better managing costs, promoting energy efficiency, protecting the environment, and creating consumer value.

GHK

In February 2012, the Company completed the acquisition of GHK. With its headquarters in London, GHK is a multi-disciplinary consultancy serving government and commercial clients on environment, employment, health, education and training, transportation, social policy, business and economic development, and international development issues. The purchase was immaterial to the Company’s financial statements taken as a whole. The acquisition complemented and significantly strengthened the Company’s existing European operations and created additional capabilities in Asian markets.

Ironworks

Effective December 31, 2011, the Company acquired Ironworks, an interactive web development firm that provides customer engagement solutions across web, mobile, and social media platforms to companies in the health, energy, and financial services industries, as well as to U.S. federal government agencies and nonprofit organizations. The addition of Ironworks complemented the Company’s existing services and provided new selling opportunities in the federal, commercial energy, and nonprofit space, while offering additional opportunities in the financial and commercial health segments. The aggregate purchase price was approximately $101.9 million in cash, including the working capital adjustment required by the stock purchase agreement.

The following unaudited condensed pro forma information presents combined financial information as if the acquisition of Ironworks had been effective at the beginning of the twelve-month period presented. The pro forma information includes adjustments reflecting changes in the amortization of intangibles, acquisition-related expense, and interest expense, and records income tax effects as if Ironworks had been included in the Company’s results of operations for the year ended December 31:

(in thousands except per share amounts)	(Unaudited) 2011
Revenue	$	898,528
Operating income		63,061
Net income		36,309
Earnings per share:
Basic earnings per share	$	1.84
Diluted earnings per share	$	1.82

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

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+ Details

Note G - Accrued Salaries and Benefits

12 Months Ended

Dec. 31, 2013

NOTE G—ACCRUED SALARIES AND BENEFITS

Accrued salaries and benefits consisted of the following at December 31:

	2013		2012
Accrued paid time off (“PTO”) and leave	$	7,769	$	10,064
Accrued salaries		18,707		17,427
Accrued bonuses and commissions		10,335		7,032
Accrued medical		3,238		2,995
Other		5,945		4,746
Total accrued salaries and benefits	$	45,994	$	42,264

- Definition

The entire disclosure for compensation costs, including compensated absences accruals, compensated absences liability, deferred compensation arrangements and income statement compensation items. Deferred compensation arrangements may include a description of an arrangement with an individual employee, which is generally an employment contract between the entity and a selected officer or key employee containing a promise by the employer to pay certain amounts at designated future dates, usually including a period after retirement, upon compliance with stipulated requirements. This type of arrangement is distinguished from broader based employee benefit plans as it is usually tailored to the employee. Disclosure also typically includes the amount of related compensation expense recognized during the reporting period, the number of shares (units) issued during the period under such arrangements, and the carrying amount as of the balance sheet date of the related liability.

+ References + Details

Note H - Accrued Expenses

12 Months Ended

Dec. 31, 2013

Payables and Accruals [Abstract]

Accounts Payable and Accrued Liabilities Disclosure [Text Block]

NOTE H—ACCRUED EXPENSES

Accrued expenses consisted of the following at December 31:

	2013		2012
Accrued subcontractor and other direct costs	$	19,480	$	16,949
Deposits		3,530		5,732
Accrued IT and software licensing costs		4,173		3,008
Accrued insurance premiums		1,454		1,382
Accrued professional services		1,120		857
Other accrued expenses		2,499		3,851
Total accrued expenses	$	32,256	$	31,779

Note I - Long-Term Debt

12 Months Ended

Dec. 31, 2013

Disclosure Text Block [Abstract]

Long-term Debt [Text Block]

NOTE I—LONG-TERM DEBT

The Company entered into a Third Amended and Restated Business Loan and Security Agreement (the “Credit Facility”) on March 14, 2012, as amended on May 29, 2012 and on July 31, 2013, with a syndication of eleven commercial banks to allow for borrowings of up to $500.0 million for a period of five years (maturing March 14, 2017) under a revolving line of credit. The Credit Facility amends and restates the Company’s previous agreement entered into on February 20, 2008, which had allowed for borrowings of up to $350.0 million. The Credit Facility provides for borrowings of up to $400.0 million without a borrowing base requirement, subject to limitations based upon certain financial, performance-based calculations. The Credit Facility also provides for an “accordion feature,” which permits additional revolving credit commitments of up to $100.0 million, subject to lenders’ approval. The Company incurred approximately $2.0 million in additional debt issuance costs in 2012 related to amending the Credit Facility, which are amortized over the term of the agreement. The Credit Facility is collateralized by substantially all of the assets of the Company and requires that the Company remain in compliance with certain financial and non-financial covenants. The financial covenants, as defined in the Credit Facility, require, among other things, that the Company maintain, on a consolidated basis for each quarter, a fixed charge coverage ratio of not less than 1.25 to 1.00 and a leverage ratio of not more than 3.75 to 1.00. As of December 31, 2013, the Company was in compliance with its covenants under the Credit Facility.

The Company has the ability to borrow funds under its Credit Facility at interest rates based on both LIBOR and prime rates, at its discretion, plus their applicable margins. Interest rates on debt outstanding ranged from 1.42% to 1.46% during 2013.

As of December 31, 2013, the Company had $40.0 million in long-term debt outstanding, $3.0 million in outstanding letters of credit, and unused borrowing capacity of $357.0 million under the Credit Facility. As of December 31, 2013, available borrowing capacity excluding the accordion feature under the Credit Facility, taking into account the financial, performance-based limitations, was $314.0 million.

The Company’s debt issuance costs are amortized over the term of indebtedness. Amortizable debt issuance costs were $4.6 million as of December 31, 2013 and 2012. Accumulated amortization related to debt issuance costs was $3.1 million and $2.6 million, as of December 31, 2013 and 2012, respectively. Amortization expense of $0.5 million, $0.6 million, and $0.5 million was recorded for the years ended December 31, 2013, 2012, and 2011, respectively.

Long-term debt consisted of the following at December 31:

		2013				2012
Revolving Line of Credit/Swing Line. Outstanding borrowings bear daily interest at a base rate (based on the U.S. Prime Rate, which was 3.25% at December 31, 2013 and December 31, 2012, plus a spread) or LIBOR (1, 3, or 6 month rates) plus a spread, payable monthly		$	40,000			$	105,000

Letters of Credit

At December 31, 2013 and 2012, the Company had outstanding letters of credit totaling approximately $3.0 million and $2.9 million, respectively. These letters of credit are renewed annually.

Note J - Income Taxes

12 Months Ended

Dec. 31, 2013

Income Tax Disclosure [Abstract]

Income Tax Disclosure [Text Block]

NOTE J—INCOME TAXES

Income tax expense consisted of the following at December 31:

	2013			2012		2011
Current:
Federal	$	15,154		$	7,730	$	20,632
State		3,247			1,328		4,274
Foreign		1,651			1,184		801
		20,052			10,242		25,707
Deferred:
Federal		2,523			10,977		(3,173	)
State		323			2,550		(630	)
Foreign		(2	)		67		(9	)
		2,844			13,594		(3,812	)
Income Tax Expense	$	22,896		$	23,836	$	21,895

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and income tax purposes. Such amounts are classified in the consolidated statements of financial position as current or non-current assets or liabilities based upon the classification of the related assets and liabilities.

Deferred tax assets (liabilities) consisted of the following at December 31:

	2013			2012
Deferred Tax Assets
Current:
Stock option compensation	$	503		$	214
Allowance for bad debt		687			573
Accrued PTO		2,647			3,026
Accrued bonus		524			408
Foreign tax credits		642			174
Accrued liabilities		1,474			202
Total current deferred tax asset		6,477			4,597
Non-current:
Foreign net operating loss (NOL) carry forward		784			548
Stock option compensation		2,237			3,497
Deferred rent		4,096			3,303
Deferred compensation		2,273			1,783
Foreign tax credits		947			1,047
State tax credits		712			—
Other		2,592			1,892
Total non-current deferred tax assets		13,641			12,070
Less: Valuation Allowance		(513	)		(463	)
Total Deferred Tax Assets	$	19,605		$	16,204
Deferred Tax Liabilities
Current:
Retention	$	(1,319	)	$	(1,228	)
Section 481(a) adjustment		—			(674	)
Prepaids		(946	)		(1,400	)
Payroll taxes		(819	)		(766	)
Unbilled revenue		(9,449	)		(6,319	)
Other		(88	)		—
Total current deferred liability		(12,621	)		(10,387	)
Non-current:
Depreciation		(4,751	)		(5,715	)
Amortization		(19,022	)		(14,615	)
Other		(135	)		(358	)
Total non-current deferred tax liabilities		(23,908	)		(20,688	)
Total Deferred Tax Liabilities		(36,529	)		(31,075	)
Total Net Deferred Tax Liability	$	(16,924	)	$	(14,871	)

At December 31, 2013 and 2012, the Company had net operating loss carry-forwards for foreign income taxes of approximately $1.6 million and $1.4 million, respectively, some of which will expire in 2018 and others which may be carried forward indefinitely.

At December 31, 2013, the Company had gross state income tax credit carry-forwards of approximately $1.0 million, which expire between 2017 and 2023. A deferred tax asset of approximately $0.7 million (net of federal benefit) has been established related to these state income tax credit carry-forwards as of December 31, 2013.

The need to establish valuation allowances for deferred assets is based on a more-likely-than-not threshold that the benefit of such assets will be realized in future periods. Appropriate consideration has been given to all available evidence, including historical operating results, projections of taxable income, and tax planning alternatives. The Company concluded that a valuation allowance of approximately $0.5 million is required for tax attributes related to specified foreign jurisdictions as of each of December 31, 2013 and 2012.

Effective January 1, 2009, the Company made no provisions for deferred U.S. income taxes or additional foreign taxes on any unremitted earnings of its controlled foreign subsidiaries because the Company considers these earnings to be permanently invested. If these earnings were repatriated, in the form of dividends or otherwise, the Company would be subject to U.S. income tax on these earnings. Determination of the amount of unrecognized deferred U.S. income tax liability is not practicable due to the complexities associated with this hypothetical calculation; however, unrecognized foreign tax credit carry forwards would be available to reduce some portion of the U.S. tax liability. The Company has $1.6 million of foreign tax credits available for carry forward related to its foreign branch operations as of December 31, 2013.

The total amount of unrecognized tax benefits as of December 31, 2013 and 2012, was $0.7 million and $1.1 million, respectively. Included in the balance as of December 31, 2013 and 2012, were $0.2 million and $0.6 million, respectively, of tax positions that, if recognized, would impact the effective tax rate.

The unrecognized tax benefit reconciliation, excluding penalty and interest, is as follows:

Unrecognized tax benefits at January 1, 2011	$	944
Increase attributable to tax positions taken during the current period		117
Unrecognized tax benefits at December 31, 2011		1,061
Increase attributable to tax positions taken during a prior period		78
Decrease attributable to lapse of statute of limitations		(48	)
Unrecognized tax benefits at December 31, 2012		1,091
Decrease attributable to settlements		(8	)
Increase attributable to tax positions taken during a prior period		43
Decrease attributable to lapse of statute of limitations		(424	)
Unrecognized tax benefits at December 31, 2013	$	702

The Company’s policy is not to recognize accrued interest and penalties related to unrecognized tax benefits as a component of tax expense. The Company had approximately $0.2 million and $0.4 million of accrued penalty and interest at December 31, 2013, and 2012, respectively.

The Company’s 2008 through 2013 tax years remain subject to examination by the Internal Revenue Service for U.S. federal tax purposes. In addition, certain significant state and foreign tax jurisdictions are either currently under examination or remain open under the statute of limitations and subject to examination for the tax years from 2008 to 2013.

Although the Company believes it has adequately provided for all uncertain tax positions, amounts asserted by taxing authorities could be greater than the Company’s accrued position. Accordingly, additional provisions on federal, state and foreign income tax related matters could be recorded in the future as revised estimates are made or the underlying matters are effectively settled or otherwise resolved. Conversely, the Company could settle positions with the tax authorities for amounts lower than have been accrued. The Company believes it is reasonably possible that, during the next 12 months, the Company’s liability for uncertain tax positions may decrease by approximately $0.4 million.

The Company’s provision for income taxes differs from the anticipated United States federal statutory rate. Approximate differences between the statutory rate and the Company’s provision are as follows:

	2013			2012			2011
Taxes at statutory rate		35.0	%		35.0	%		35.0	%
State taxes, net of federal benefit		4.2	%		4.6	%		4.6	%
Foreign tax rate differential and U.S. unrepatriated earnings		(0.3	)%		(0.3	)%		0	%
Other permanent differences		0.7	%		0.8	%		0.6	%
Prior year tax adjustments and changes in unrecognized tax benefits		(2.1	)%		(0.9	)%		(1.2	)%
Tax credits		(0.7	)%		(0.7	)%		(0.4	)%
		36.8	%		38.5	%		38.6	%

Note K - Accounting for Stock-Based Compensation

12 Months Ended

Dec. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Disclosure of Compensation Related Costs, Share-based Payments [Text Block]

NOTE K—ACCOUNTING FOR STOCK-BASED COMPENSATION

Stock Incentive Plans

On June 4, 2010, the Company’s stockholders ratified the ICF International, Inc. 2010 Omnibus Incentive Plan (the “Omnibus Plan”), which was adopted by the Company on March 8, 2010. The Omnibus Plan replaced the 2006 Long-Term Equity Incentive Plan (the “2006 Plan”), which the Company had used for equity and incentive awards since becoming a publicly traded company in 2006. The Omnibus Plan provides for the granting of options, stock appreciation rights, restricted stock, RSUs, performance shares, performance units, cash-based awards, and other stock-based awards to officers, key employees of the Company, and non-employee directors. On June 7, 2013, the Company’s stockholders ratified an amendment (the “Amendment”) to the Omnibus Plan (“the Amended Plan”). The Amendment, upon adoption by the Company on June 7, 2013, allowed for the Company to grant an additional 1.8 million shares under the Omnibus Plan, for a total of approximately 3.55 million shares. Under the Amended Plan, shares awarded that are not stock options or stock appreciation rights are counted as 1.93 shares deducted from the Amended Plan for every one share delivered under those awards. Shares awarded that are stock options or stock appreciation rights are counted as a single share deducted from the Amended Plan for every one share delivered under those awards. As of December 31, 2013, the Company had approximately 2.1 million shares available to grant under the Amended Plan. CSRSUs have no impact on the shares available for grant under the Omnibus Plan, and have no impact on the calculated shares used in earnings per share calculations.

Options and RSUs generally have a vesting term of three to four years. Restricted stock awards generally vest upon issuance. CSRSUs generally vest annually over a four-year vesting term.

Total compensation expense relating to stock-based compensation was approximately $11.9 million, $8.8 million, and $6.7 million for the years ended December 31, 2013, 2012, and 2011, respectively.

As of December 31, 2013, the total unrecognized compensation expense related to non-vested stock awards totaled approximately $14.4 million. These amounts are expected to be recognized over a weighted-average period of 1.8 years.

The assumptions of post-vesting employment termination forfeiture rates used in the determination of fair value of stock awards during calendar year 2013 were based on the Company’s historical average from October 2006 through the 12 months preceding the reporting period. The expected annualized forfeiture rates used varied from 4.67% to 9.77%, and the Company does not expect these termination rates to vary significantly in the future.

Stock Options

Option awards are granted with an exercise price equal to the market value of the Company’s common stock on the date of grant. All options outstanding as of December 31, 2013, have a 10-year contractual term. The Company recorded approximately $1.6 million, $1.4 million, and $1.1 million of compensation expense related to stock options for the years ended December 31, 2013, 2012, and 2011, respectively. The fair value assumptions using the Black-Scholes-Merton pricing model for awards in 2013 were 5.4 years for the expected life, 36.8% for historical volatility, and 0.9% for the risk-free rate of return. The fair value assumptions for awards in 2012 were a range of 5.1 to 5.4 years for the expected life, a range of 41.0% to 42.3% for historical volatility, and a range of 0.7% to 1.1% for the risk-free rate of return. The fair value assumptions for awards in 2011 were 5.6 years for the expected life, 42.3% for historical volatility, and 2.2% for the risk-free rate of return. At December 31, 2013, unrecognized expense related to stock options totaled approximately $2.2 million, and these costs are expected to be recognized over a weighted average period of 2.2 years.

The following table summarizes the changes in outstanding stock options:

	Shares			Weighted Average Exercise Price		Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2011		392,369		$	19.32
Exercised		(39,487	)	$	12.11
Granted		190,552		$	21.77
Forfeited/Expired		(82,781	)	$	21.85
Outstanding at December 31, 2011		460,653		$	20.50
Exercised		(11,521	)	$	6.73
Granted		203,436		$	25.39
Forfeited/Expired		(13,768	)	$	24.58
Outstanding at December 31, 2012		638,800		$	22.21
Exercised		(159,309	)	$	19.48
Granted		218,707		$	27.03
Forfeited/Expired		(3,646	)	$	24.84
Outstanding at December 31, 2013		694,552		$	24.34	$	7,203

Vested plus expected to vest at December 31, 2013		678,431		$	24.29	$	7,069
Exercisable at December 31, 2013		291,251		$	22.35	$	3,600

The aggregate intrinsic value in the preceding table is based on the Company’s closing stock price of $34.71 as of December 31, 2013. The total intrinsic value of options exercised was $2.3 million, $0.2 million and $0.5 million for the years ended December 31, 2013, 2012 and 2011, respectively. The weighted average grant date fair value of options granted was $9.37, $9.77 and $9.18 per share for the years ended December 31, 2013, 2012 and 2011, respectively. The fair value of shares vested was $1.6 million, $1.0 million, and $0.7 million, for the years ended December 31, 2013, 2012 and 2011, respectively. As of December 31, 2013, the weighted-average remaining contractual term for options vested and expected to vest was 7.6 years, and 6.3 years for exercisable options.

Information regarding stock options outstanding as of the dates indicated is summarized below:

			OPTIONS OUTSTANDING						OPTIONS EXERCISABLE
Range of Exercise Prices			Number Outstanding As of 12/31/13		Weighted Average Remaining Contractual Term		Weighted Average Exercise Price		Number Exercisable As of 12/31/13		Weighted Average Exercise Price
$ 9.05	–	$25.00		306,472		6.20	$	21.70		241,765	$	21.67
$25.01	–	$27.00		169,373		8.21	$	25.66		49,486	$	25.66
$27.01	–	$28.00		218,707		9.21	$	27.03		—	$	—
$ 9.05	to	$28.00		694,552		7.64	$	24.34		291,251	$	22.35

Restricted Stock Awards

Pursuant to the Omnibus Plan, the Company issued 5,133 shares of restricted stock awards to its directors in the year ended December 31, 2013. The average grant date fair value of these restricted stock awards was $35.06 per share.

Compensation expense related to restricted stock awards computed under the fair value method for the years ended December 31, 2013, 2012, and 2011, was approximately $0.4 million, $0.8 million, and $0.8 million, respectively. There was no unrecognized expense related to restricted stock awards as of December 31, 2013.

A summary of the Company’s restricted stock awards is presented below.

	Number of Shares			Weighted- Average Grant Date Fair Value
Non-vested restricted stock awards at January 1, 2011		3,396		$	21.19
Granted		48,356		$	24.32
Vested		(17,088	)	$	23.87
Non-vested restricted stock awards at December 31, 2011		34,664		$	24.23
Granted		36,139		$	22.41
Vested		(34,664	)	$	24.23
Non-vested restricted stock awards at December 31, 2012		36,139		$	22.41
Granted		5,133		$	35.06
Vested		(35,958	)	$	24.19
Forfeited		(5,314	)	$	22.58
Non-vested restricted stock awards at December 31, 2013		—		$	—

The fair value of shares vested was $0.9 million, $0.8 million, and $0.4 million, for the years ended December 31, 2013, 2012 and 2011, respectively.

Restricted Stock Units

During the year ended December 31, 2013, the Company awarded 229,574 RSUs to employees that vest over 4 years. Upon vesting, the employee is issued one share of stock for each restricted stock unit he or she holds. The weighted-average grant date fair value of restricted stock units granted during the year ended December 31, 2013, was $27.02 per share.

Compensation expense related to RSUs computed under the fair value method for the years ended December 31, 2013, 2012, and 2011, was approximately $8.7 million, $6.6 million, and $4.8 million, respectively.

At December 31, 2013, unrecognized expense related to RSUs totaled approximately $12.2 million. These costs are expected to be recognized over a weighted-average period of 2.0 years. The aggregate intrinsic value of RSUs at December 31, 2013 that are expected to vest was approximately $25.0 million. The fair value of shares vested was $7.0 million, $5.7 million, and $4.0 million, for the years ended December 31, 2013, 2012 and 2011, respectively.

A summary of the Company’s RSUs is presented below.

	Number of Shares			Weighted- Average Grant Date Fair Value		Aggregate Intrinsic Value (in thousands)
Non-vested RSUs at January 1, 2011		653,324		$	25.05
Granted		350,375		$	21.69
Vested		(176,251	)	$	22.56
Cancelled		(58,429	)	$	24.01
Non-vested RSUs at December 31, 2011		769,019		$	23.67
Granted		374,868		$	25.42
Vested		(230,632	)	$	24.66
Cancelled		(64,664	)	$	24.24
Non-vested RSUs at December 31, 2012		848,591		$	24.32
Granted		229,574		$	27.02
Vested		(288,258	)	$	24.28
Cancelled		(33,719	)	$	24.86
Non-vested RSUs at December 31, 2013		756,188		$	25.13	$	26,247
Restricted stock units expected to vest in the future		718,858		$	25.13	$	24,952

The aggregate intrinsic value in the preceding table is based on the Company’s closing stock price of $34.71 per share as of December 31, 2013.

Cash-Settled Restricted Stock Units

Compensation expense related to CSRSUs computed under the fair value method for the year ended December 31, 2013, was $1.2 million. The unrecognized expense related to CSRSUs totaled approximately $5.3 million at December 31, 2013. These costs are expected to be recognized over a weighted-average period of 3.3 years. The aggregate intrinsic value of CSRSUs at December 31, 2013 that are expected to vest was approximately $6.5 million.

A summary of the Company’s CSRSUs is presented below.

	Shares			Weighted- Average Grant Date Fair Value		Aggregate Intrinsic Value (in thousands)
Non-vested CSRSUs at December 31, 2012		—		$	—
Granted		203,115		$	27.84
Cancelled		(2,816	)	$	27.03
Non-vested CSRSUs at December 31, 2013		200,299		$	28.23	$	6,952
CSRSUs expected to vest in the future		187,760		$	28.30	$	6,517

The aggregate intrinsic value in the preceding table is based on the Company’s closing stock price of $34.71 per share as of December 31, 2013.

Note L - Fair Value Measurement

12 Months Ended

Dec. 31, 2013

Disclosure Text Block [Abstract]

Fair Value, Measurement Inputs, Disclosure [Text Block]

NOTE L—FAIR VALUE MEASUREMENT

We perform fair value measurements in accordance with the guidance provided by ASC 820. ASC 820 defines fair value as the exchange price that would be received for an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants at the measurement date.

ASC 820 establishes a fair value hierarchy that prioritizes the inputs used to measure fair value into three levels as follows:

•	Level 1 – Quoted prices for identical instruments in active markets

•	Level 2 – Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations whose inputs are observable or whose significant value drivers are observable.

•	Level 3 – Instruments whose significant value drivers are unobservable

The fair value standards require an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. When a valuation includes inputs from multiple sources at various levels in the fair value hierarchy, the assets or liabilities are classified at the lowest level for which the input has a significant effect on the overall valuation.

Assets and liabilities measured at fair value on a recurring basis on the Company’s consolidated balance sheets at December 31, 2013 consisted primarily of contingent consideration in connection with business combinations.

Contingent consideration at December 31, 2013 related to the Company’s acquisition of ECA in July 2013 as discussed in “Note F —Business Combinations.” In accordance with the purchase agreement for ECA, the Company is required to pay consideration in the event that ECA achieves certain specified earnings results during the three-year period subsequent to acquisition. The Company determines the fair value of contingent consideration using a discounted cash flow model which includes a probability assessment of expected future cash flows related to ECA. The fair value measurement uses significant inputs that are not observable in the market and thus represents a Level 3 fair value measurement. At December 31, 2013, the fair value of contingent consideration was $2.8 million. There were no amounts recorded for contingent consideration at December 31, 2012.

In addition, the Company accounts for forward contract agreements in the consolidated balance sheets as either an asset or liability measured at fair value. The fair value of the hedges at December 31, 2013 and 2012 and the changes in fair value for the years ended December 31, 2013, 2012, and 2011 were immaterial.

Note M - Earnings Per Share

12 Months Ended

Dec. 31, 2013

Earnings per Share: [Abstract]

Earnings Per Share [Text Block]

NOTE M—EARNINGS PER SHARE

Earnings Per Share

Basic earnings per share (“EPS”) is computed by dividing reported net income by the weighted-average number of shares outstanding. Diluted EPS considers the potential dilution that could occur if common stock equivalents were exercised or converted into stock. The difference between the basic and diluted weighted-average equivalent shares with respect to the Company’s EPS calculation is due entirely to the assumed exercise of stock options and the vesting of restricted stock and RSUs. The effect of 173,168 and 1,945 RSUs had no impact upon the years ended December 31, 2013, and 2012, respectively, because they were anti-dilutive to EPS. The dilutive effect of stock options and awards for each period reported is summarized below:

	2013		2012		2011
	(in thousands)
Basic weighted-average shares outstanding		19,755		19,663		19,684
Effect of potential exercise of stock options and unvested restricted stock and RSUs		431		294		244
Diluted weighted-average shares outstanding		20,186		19,957		19,928

Note N - Share Repurchase Program

12 Months Ended

Dec. 31, 2013

Disclosure Text Block Supplement [Abstract]

Treasury Stock [Text Block]

NOTE N—SHARE REPURCHASE PROGRAM

In 2011, the Company’s Board of Directors approved a share repurchase program, authorizing the Company to repurchase in the aggregate up to $35.0 million of its outstanding common stock. In the third quarter of 2013, the Company’s Board of Directors approved a new share repurchase plan to go into effect in November 2013 and expiring in November 2015, also authorizing us to repurchase in the aggregate up to $35.0 million of our outstanding common stock. Purchases under this program may be made from time to time at prevailing market prices in open market purchases or in privately negotiated transactions pursuant to Rules 10b5-1 and 10b-18 under the Securities Exchange Act of 1934, as amended and in accordance with applicable insider trading and other securities laws and regulations. The purchases will be funded from existing cash balances and/or borrowings, and the repurchased shares will be held in treasury and used for general corporate purposes. The timing and extent to which the Company repurchases its shares will depend upon market conditions and other corporate considerations as may be considered in the Company’s sole discretion.

During the year ended December 31, 2013, the Company repurchased 160,043 shares under this program at an average price of $33.46 per share. Of the $35.0 million approved for share repurchases, approximately $29.6 million remained available as of December 31, 2013.

Note O - Commitments and Contingencies

12 Months Ended

Dec. 31, 2013

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies Disclosure [Text Block]

NOTE O—CONTINGENCIES AND COMMITMENTS

Litigation and Claims

The Company is involved in various legal matters and proceedings arising in the ordinary course of business. While these matters and proceedings cause it to incur costs, including, but not limited to, attorneys’ fees, the Company currently believes that any ultimate liability arising out of these matters and proceedings will not have a material adverse effect on our financial position, results of operations, or cash flows.

Road Home Contract

Although no legal proceeding has been commenced, the Company has received correspondence from the Office of Community Development of the State of Louisiana, claiming that the Company is responsible for the overpayment of Road Home program grant funds to some grant applicants. The State has also indicated that, as it continues to review homeowner grant calculations, it expects to assert additional demands in the future, increasing the aggregate claim amount. The total claim received by the Company to date is approximately $82.3 million. The Company believes this claim has no merit, intends to vigorously defend its position, and has therefore not recorded a liability as of December 31, 2013.

Operating Leases

On March 8, 2010, the Company entered into a new lease that replaced its prior headquarters lease, which was due to expire in October 2012. The new lease was initially for 257,879 square feet, with 53,157 square feet of additional space subsequently added. The lease commenced on April 1, 2010, and will expire on December 31, 2022. Base rent under the agreement is approximately $0.5 million per month with annual escalations fixed at 2.5% per year, yielding a total lease commitment of approximately $89.3 million over the twelve-year term of the lease. The Company did not incur any early termination penalties for the termination of the original lease.

The Company has entered into various other operating leases for equipment and office space. Certain facility leases may contain fixed escalation clauses, certain facility leases require the Company to pay operating expenses in addition to base rental amounts, and seven leases require the Company to maintain letters of credit. Rent expense is recognized on a straight-line basis over the lease term. Rent expense for operating leases was approximately $36.5 million for 2013. Rent expense and sub-lease income for operating leases were approximately $35.6 million and less than $0.1 million, respectively, for 2012, and approximately $32.0 million and $0.2 million, respectively, for 2011.

Future minimum rental payments under all non-cancelable operating leases are as follows:

Year ending December 31,
2014	$	30,422
2015		31,627
2016		30,524
2017		29,250
2018		6,641
Thereafter		136,667
	$	265,131

Note P - Employee Benefit Plans

12 Months Ended

Dec. 31, 2013

Disclosure Text Block Supplement [Abstract]

Compensation and Employee Benefit Plans [Text Block]

NOTE P—EMPLOYEE BENEFIT PLANS

Retirement Savings Plan

Effective June 30, 1999, the Company established the ICF Consulting Group Retirement Savings Plan (the “Retirement Savings Plan”). The Retirement Savings Plan is a defined contribution profit sharing plan with a cash or deferred arrangement under Section 401(k) of the Internal Revenue Code.

Participants in the Retirement Savings Plan are able to elect to defer up to 70% of their compensation subject to statutory limitations, and were entitled to receive 100% employer matching contributions for the first 3% and 50% for the next 2% of their compensation. Contribution expense related to the Retirement Savings Plan for the years ended December 31, 2013, 2012, and 2011, was approximately $12.0 million, $11.8 million, and $10.3 million, respectively.

Deferred Compensation Plan

Certain key employees of the Company are eligible to defer a specified percentage of their cash compensation by having it contributed to a nonqualified deferred compensation plan. Eligible employees may elect to defer up to 80% of their base salary and up to 100% of performance bonuses, reduced by any amounts withheld for the payment of taxes or other deductions required by law. Participants are at all times 100% vested in their account balances. The Company funds its deferred compensation liabilities by making cash contributions to a Rabbi Trust at the time the salary or bonus being deferred would otherwise be payable to the employee. Gains or losses on amounts held by the Rabbi Trust are fully allocable to plan participants. As a result, the plan has no material net impact on the Company’s results of operations and the liability to plan participants is fully funded at all times.

Employee Stock Purchase Plan

The Company has a 2006 Employee Stock Purchase Plan (“ESPP”) under which one million shares have been authorized for issuance. The ESPP allows eligible employees to purchase shares of our common stock through payroll deductions up to $25,000 per calendar year over six-month offering periods at a discount not to exceed 5% of the market value on the date of each purchase period. For the year ended December 31, 2013, 23,457 shares were purchased by employees and 834,599 shares remain available for future issuance. The Company does not recognize compensation expense related to the ESPP.

Note Q - Supplemental Information

12 Months Ended

Dec. 31, 2013

Supplemental Cash Flow Elements [Abstract]

Cash Flow, Supplemental Disclosures [Text Block]

NOTE Q—SUPPLEMENTAL INFORMATION

Valuation and Qualifying Accounts

Allowance for Doubtful Accounts

	2013		2012			2011
Balance at beginning of period	$	1,448	$	1,746		$	1,922
Bad debt expense		112		336			(64	)
Net recoveries (write-offs)		193		(634	)		(112	)
Balance at end of period	$	1,753	$	1,448		$	1,746

Note R - Selected Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information [Text Block]

NOTE R—SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)

	2013								2012
	1Q		2Q		3Q		4Q		1Q		2Q		3Q		4Q
Contract revenue	$	233,921	$	241,568	$	244,055	$	229,759	$	227,641	$	239,649	$	237,864	$	231,979
Operating income		17,649		17,295		17,154		12,587		16,374		18,268		16,995		14,545
Net income	$	10,112	$	10,331	$	11,131	$	7,756	$	8,937	$	10,346	$	9,573	$	9,219
Earnings per share:
Basic	$	0.52	$	0.52	$	0.56	$	0.39	$	0.45	$	0.52	$	0.49	$	0.47
Diluted		0.51		0.52		0.55		0.38		0.45		0.52		0.48		0.47
Weighted-average common shares outstanding
Basic		19,543		19,706		19,802		19,826		19,769		19,774		19,610		19,501
Diluted		19,875		19,996		20,165		20,233		20,082		19,971		19,770		19,690

Note S - Subsequent Events

12 Months Ended

Dec. 31, 2013

Subsequent Events [Abstract]

Subsequent Events [Text Block]

NOTE S—SUBSEQUENT EVENTS

In February 2014, the Company completed the acquisition of Mostra SA, a strategic communications consulting company based in Brussels, Belgium. The purchase was immaterial to the Company’s financial statements taken as a whole. The acquisition extends the Company’s strategic communications capabilities to enhance ICF’s policy and advisory work in Europe.

In February 2014, the Company announced that it had signed a definitive agreement to purchase CITYTECH, Inc., a Chicago-based digital interactive consultancy specializing in enterprise applications development, web experience management, mobile application development, cloud enablement and managed services. The purchase will be immaterial to the Company’s financial statements taken as a whole. The acquisition will add expertise to the Company’s content management capabilities and complement its digital and interactive business.

Accounting Policies, by Policy (Policies)

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Revenue Recognition, Policy [Policy Text Block]

Revenue Recognition

	•	Time-and-Materials Contracts. Revenue for time-and-materials contracts is recorded on the basis of allowable labor hours worked multiplied by the contract-defined billing rates, plus the costs of other items used in the performance of the contract. Profits and losses on time-and-materials contracts result from the difference between the cost of services performed and the contract-defined billing rates for these services.

	•	Cost-Based Contracts. Revenue under cost-based contracts is recognized as costs are incurred. Applicable estimated profit, if any, is included in earnings in the proportion that incurred costs bear to total estimated costs. Incentives, award fees, or penalties related to performance are also considered in estimating revenue and profit rates based on actual and anticipated awards, based on factors such as the Company’s prior award experience and communications with the customer regarding performance.

	•	Fixed-Price Contracts. Revenue for fixed-price contracts is recognized when earned, generally as work is performed. Services performed vary from contract to contract and are not always uniformly performed over the term of the arrangement. We recognize revenue in a number of different ways on fixed-price contracts, including:

•

	•	Contractual Outputs: Revenue on certain fixed-price contracts is recognized based upon outputs completed to date expressed as a percentage of total outputs required in the contract or based upon units delivered to the customer multiplied by the contract-defined unit price.

	•	Straight-Line: When services are performed or are expected to be performed consistently throughout an arrangement, revenue on those fixed-price contracts is recognized ratably over the period benefited.

	•	Completed Contract: Revenue and costs on certain fixed-price contracts are recognized at completion if the final act is so significant to the arrangement that value is deemed to be transferred only at completion.

The approximate percentage of revenue by contract type was as follows:

	Year ended December 31,
	2013			2012			2011
Time-and-materials		52	%		49	%		49	%
Fixed-price		29	%		30	%		28	%
Cost-based		19	%		21	%		23	%
Total		100	%		100	%		100	%

Cash and Cash Equivalents, Policy [Policy Text Block]

Cash and Cash Equivalents

The Company considers cash on deposit and all highly liquid investments with original maturities of three months or less to be cash and cash equivalents.

Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy [Policy Text Block]

Allowance for Doubtful Accounts

Property, Plant and Equipment, Policy [Policy Text Block]

Property and Equipment

Goodwill and Intangible Assets, Policy [Policy Text Block]

Goodwill and Other Intangible Assets

Research, Development, and Computer Software, Policy [Policy Text Block]

Capitalized Software

Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]

Stock-based Compensation

Foreign Currency Transactions and Translations Policy [Policy Text Block]

Foreign Currency Translation

Deferred Charges, Policy [Policy Text Block]

Deferred Rent

Fair Value of Financial Instruments, Policy [Policy Text Block]

Fair Value of Financial Instruments

Income Tax, Policy [Policy Text Block]

Income Taxes

Treasury Shares [Policy Text Block]

Treasury Shares

Treasury shares are accounted for under the cost method.

Segment Reporting, Policy [Policy Text Block]

Segment

Concentration Risk, Credit Risk, Policy [Policy Text Block]

Risks and Uncertainties

Use of Estimates, Policy [Policy Text Block]

Use of Estimates

Note B - Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Revenue Percentage By Contract Type [Table Text Block]

	Year ended December 31,
	2013			2012			2011
Time-and-materials		52	%		49	%		49	%
Fixed-price		29	%		30	%		28	%
Cost-based		19	%		21	%		23	%
Total		100	%		100	%		100	%

Note C - Contract Receivables (Tables)

12 Months Ended

Dec. 31, 2013

Receivables [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

	2013			2012
Billed	$	102,995		$	133,014
Unbilled		96,243			66,814
Retainages		3,914			3,654
Other		3,663			2,904
Allowance for doubtful accounts		(1,753	)		(1,448	)
Contract receivables, net	$	205,062		$	204,938

Note D - Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2013

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Table Text Block]

	2013			2012
Leasehold improvements	$	9,224		$	6,379
Software		27,677			24,948
Furniture and equipment		17,127			15,174
Computers		25,415			23,466
		79,443			69,967
Accumulated depreciation and amortization		(49,229	)		(41,107	)
Total property and equipment, net	$	30,214		$	28,860

Note E - Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill [Table Text Block]

	2013			2012
Balance as of January 1	$	410,583		$	401,134
Goodwill resulting from the Ironworks business combination		—			119
Goodwill resulting from the GHK business combination		(101	)		7,857
Goodwill resulting from the Symbiotic Engineering business combination		—			1,473
Goodwill resulting from the ECA business combination		8,357			—
Balance as of December 31	$	418,839		$	410,583

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	2013			2012
Customer-related intangibles	$	58,829		$	58,204
Developed technology		960			3,237
Marketing trade name		—			814
		59,789			62,255
Less: accumulated amortization		(47,550	)		(41,239	)
Total other intangible assets, net	$	12,239		$	21,016

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Year ending December 31,
2014	$	5,737
2015		3,012
2016		1,719
2017		1,024
2018		519
Thereafter		228
	$	12,239

Note F - Business Combinations (Tables)

12 Months Ended

Dec. 31, 2013

Business Combinations [Abstract]

Business Acquisition, Pro Forma Information [Table Text Block]

(in thousands except per share amounts)	(Unaudited) 2011
Revenue	$	898,528
Operating income		63,061
Net income		36,309
Earnings per share:
Basic earnings per share	$	1.84
Diluted earnings per share	$	1.82

Note G - Accrued Salaries and Benefits (Tables)

12 Months Ended

Dec. 31, 2013

Schedule Of Accrued Employee Benefits [Table Text Block]

	2013		2012
Accrued paid time off (“PTO”) and leave	$	7,769	$	10,064
Accrued salaries		18,707		17,427
Accrued bonuses and commissions		10,335		7,032
Accrued medical		3,238		2,995
Other		5,945		4,746
Total accrued salaries and benefits	$	45,994	$	42,264

Note H - Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2013

Payables and Accruals [Abstract]

Schedule of Accrued Liabilities [Table Text Block]

	2013		2012
Accrued subcontractor and other direct costs	$	19,480	$	16,949
Deposits		3,530		5,732
Accrued IT and software licensing costs		4,173		3,008
Accrued insurance premiums		1,454		1,382
Accrued professional services		1,120		857
Other accrued expenses		2,499		3,851
Total accrued expenses	$	32,256	$	31,779

Note I - Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2013

Disclosure Text Block [Abstract]

Schedule of Long-term Debt Instruments [Table Text Block]

		2013				2012
Revolving Line of Credit/Swing Line. Outstanding borrowings bear daily interest at a base rate (based on the U.S. Prime Rate, which was 3.25% at December 31, 2013 and December 31, 2012, plus a spread) or LIBOR (1, 3, or 6 month rates) plus a spread, payable monthly		$	40,000			$	105,000

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

+ Details

Note J - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	2013			2012		2011
Current:
Federal	$	15,154		$	7,730	$	20,632
State		3,247			1,328		4,274
Foreign		1,651			1,184		801
		20,052			10,242		25,707
Deferred:
Federal		2,523			10,977		(3,173	)
State		323			2,550		(630	)
Foreign		(2	)		67		(9	)
		2,844			13,594		(3,812	)
Income Tax Expense	$	22,896		$	23,836	$	21,895

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	2013			2012
Deferred Tax Assets
Current:
Stock option compensation	$	503		$	214
Allowance for bad debt		687			573
Accrued PTO		2,647			3,026
Accrued bonus		524			408
Foreign tax credits		642			174
Accrued liabilities		1,474			202
Total current deferred tax asset		6,477			4,597
Non-current:
Foreign net operating loss (NOL) carry forward		784			548
Stock option compensation		2,237			3,497
Deferred rent		4,096			3,303
Deferred compensation		2,273			1,783
Foreign tax credits		947			1,047
State tax credits		712			—
Other		2,592			1,892
Total non-current deferred tax assets		13,641			12,070
Less: Valuation Allowance		(513	)		(463	)
Total Deferred Tax Assets	$	19,605		$	16,204
Deferred Tax Liabilities
Current:
Retention	$	(1,319	)	$	(1,228	)
Section 481(a) adjustment		—			(674	)
Prepaids		(946	)		(1,400	)
Payroll taxes		(819	)		(766	)
Unbilled revenue		(9,449	)		(6,319	)
Other		(88	)		—
Total current deferred liability		(12,621	)		(10,387	)
Non-current:
Depreciation		(4,751	)		(5,715	)
Amortization		(19,022	)		(14,615	)
Other		(135	)		(358	)
Total non-current deferred tax liabilities		(23,908	)		(20,688	)
Total Deferred Tax Liabilities		(36,529	)		(31,075	)
Total Net Deferred Tax Liability	$	(16,924	)	$	(14,871	)

Schedule of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns Roll Forward [Table Text Block]

Unrecognized tax benefits at January 1, 2011	$	944
Increase attributable to tax positions taken during the current period		117
Unrecognized tax benefits at December 31, 2011		1,061
Increase attributable to tax positions taken during a prior period		78
Decrease attributable to lapse of statute of limitations		(48	)
Unrecognized tax benefits at December 31, 2012		1,091
Decrease attributable to settlements		(8	)
Increase attributable to tax positions taken during a prior period		43
Decrease attributable to lapse of statute of limitations		(424	)
Unrecognized tax benefits at December 31, 2013	$	702

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	2013			2012			2011
Taxes at statutory rate		35.0	%		35.0	%		35.0	%
State taxes, net of federal benefit		4.2	%		4.6	%		4.6	%
Foreign tax rate differential and U.S. unrepatriated earnings		(0.3	)%		(0.3	)%		0	%
Other permanent differences		0.7	%		0.8	%		0.6	%
Prior year tax adjustments and changes in unrecognized tax benefits		(2.1	)%		(0.9	)%		(1.2	)%
Tax credits		(0.7	)%		(0.7	)%		(0.4	)%
		36.8	%		38.5	%		38.6	%

Note K - Accounting for Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2013

Restricted Stock [Member]

Note K - Accounting for Stock-Based Compensation (Tables) [Line Items]

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

	Number of Shares			Weighted- Average Grant Date Fair Value
Non-vested restricted stock awards at January 1, 2011		3,396		$	21.19
Granted		48,356		$	24.32
Vested		(17,088	)	$	23.87
Non-vested restricted stock awards at December 31, 2011		34,664		$	24.23
Granted		36,139		$	22.41
Vested		(34,664	)	$	24.23
Non-vested restricted stock awards at December 31, 2012		36,139		$	22.41
Granted		5,133		$	35.06
Vested		(35,958	)	$	24.19
Forfeited		(5,314	)	$	22.58
Non-vested restricted stock awards at December 31, 2013		—		$	—

Restricted Stock Units (RSUs) [Member]

Note K - Accounting for Stock-Based Compensation (Tables) [Line Items]

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

	Number of Shares			Weighted- Average Grant Date Fair Value		Aggregate Intrinsic Value (in thousands)
Non-vested RSUs at January 1, 2011		653,324		$	25.05
Granted		350,375		$	21.69
Vested		(176,251	)	$	22.56
Cancelled		(58,429	)	$	24.01
Non-vested RSUs at December 31, 2011		769,019		$	23.67
Granted		374,868		$	25.42
Vested		(230,632	)	$	24.66
Cancelled		(64,664	)	$	24.24
Non-vested RSUs at December 31, 2012		848,591		$	24.32
Granted		229,574		$	27.02
Vested		(288,258	)	$	24.28
Cancelled		(33,719	)	$	24.86
Non-vested RSUs at December 31, 2013		756,188		$	25.13	$	26,247
Restricted stock units expected to vest in the future		718,858		$	25.13	$	24,952

Cash Settled RSUs [Member]

Note K - Accounting for Stock-Based Compensation (Tables) [Line Items]

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

	Shares			Weighted- Average Grant Date Fair Value		Aggregate Intrinsic Value (in thousands)
Non-vested CSRSUs at December 31, 2012		—		$	—
Granted		203,115		$	27.84
Cancelled		(2,816	)	$	27.03
Non-vested CSRSUs at December 31, 2013		200,299		$	28.23	$	6,952
CSRSUs expected to vest in the future		187,760		$	28.30	$	6,517

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

	Shares			Weighted Average Exercise Price		Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2011		392,369		$	19.32
Exercised		(39,487	)	$	12.11
Granted		190,552		$	21.77
Forfeited/Expired		(82,781	)	$	21.85
Outstanding at December 31, 2011		460,653		$	20.50
Exercised		(11,521	)	$	6.73
Granted		203,436		$	25.39
Forfeited/Expired		(13,768	)	$	24.58
Outstanding at December 31, 2012		638,800		$	22.21
Exercised		(159,309	)	$	19.48
Granted		218,707		$	27.03
Forfeited/Expired		(3,646	)	$	24.84
Outstanding at December 31, 2013		694,552		$	24.34	$	7,203

Vested plus expected to vest at December 31, 2013		678,431		$	24.29	$	7,069
Exercisable at December 31, 2013		291,251		$	22.35	$	3,600

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

			OPTIONS OUTSTANDING						OPTIONS EXERCISABLE
Range of Exercise Prices			Number Outstanding As of 12/31/13		Weighted Average Remaining Contractual Term		Weighted Average Exercise Price		Number Exercisable As of 12/31/13		Weighted Average Exercise Price
$ 9.05	–	$25.00		306,472		6.20	$	21.70		241,765	$	21.67
$25.01	–	$27.00		169,373		8.21	$	25.66		49,486	$	25.66
$27.01	–	$28.00		218,707		9.21	$	27.03		—	$	—
$ 9.05	to	$28.00		694,552		7.64	$	24.34		291,251	$	22.35

Note M - Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2013

Earnings per Share: [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	2013		2012		2011
	(in thousands)
Basic weighted-average shares outstanding		19,755		19,663		19,684
Effect of potential exercise of stock options and unvested restricted stock and RSUs		431		294		244
Diluted weighted-average shares outstanding		20,186		19,957		19,928

Note O - Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2013

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

Year ending December 31,
2014	$	30,422
2015		31,627
2016		30,524
2017		29,250
2018		6,641
Thereafter		136,667
	$	265,131

Note Q - Supplemental Information (Tables)

12 Months Ended

Dec. 31, 2013

Supplemental Cash Flow Elements [Abstract]

Summary of Valuation Allowance [Table Text Block]

	2013		2012			2011
Balance at beginning of period	$	1,448	$	1,746		$	1,922
Bad debt expense		112		336			(64	)
Net recoveries (write-offs)		193		(634	)		(112	)
Balance at end of period	$	1,753	$	1,448		$	1,746

Note R - Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

	2013								2012
	1Q		2Q		3Q		4Q		1Q		2Q		3Q		4Q
Contract revenue	$	233,921	$	241,568	$	244,055	$	229,759	$	227,641	$	239,649	$	237,864	$	231,979
Operating income		17,649		17,295		17,154		12,587		16,374		18,268		16,995		14,545
Net income	$	10,112	$	10,331	$	11,131	$	7,756	$	8,937	$	10,346	$	9,573	$	9,219
Earnings per share:
Basic	$	0.52	$	0.52	$	0.56	$	0.39	$	0.45	$	0.52	$	0.49	$	0.47
Diluted		0.51		0.52		0.55		0.38		0.45		0.52		0.48		0.47
Weighted-average common shares outstanding
Basic		19,543		19,706		19,802		19,826		19,769		19,774		19,610		19,501
Diluted		19,875		19,996		20,165		20,233		20,082		19,971		19,770		19,690

Note A - Basis of Presentation and Nature of Operations (Details)	Dec. 31, 2013
Domestic [Member]
Note A - Basis of Presentation and Nature of Operations (Details) [Line Items]
Number Of Offices	50
International [Member]
Note A - Basis of Presentation and Nature of Operations (Details) [Line Items]
Number Of Offices	15

Note B - Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2013
Minimum [Member]
Note B - Summary of Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	2 years
Finite-Lived Intangible Asset, Useful Life	1 year
Maximum [Member]
Note B - Summary of Significant Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	7 years
Finite-Lived Intangible Asset, Useful Life	10 years

Note B - Summary of Significant Accounting Policies (Details) - Percentage of Revenue by Contract Type - Sales Revenue, Services, Net [Member]	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Time-and-materials Contract [Member]
Note B - Summary of Significant Accounting Policies (Details) - Percentage of Revenue by Contract Type [Line Items]
Revenue by contract type, percentage	52.00%	49.00%	49.00%
Fixed-price Contract [Member]
Note B - Summary of Significant Accounting Policies (Details) - Percentage of Revenue by Contract Type [Line Items]
Revenue by contract type, percentage	29.00%	30.00%	28.00%
Cost-based Contract [Member]
Note B - Summary of Significant Accounting Policies (Details) - Percentage of Revenue by Contract Type [Line Items]
Revenue by contract type, percentage	19.00%	21.00%	23.00%
Revenue by contract type, percentage	100.00%	100.00%	100.00%

Note C - Contract Receivables (Details)	12 Months Ended
Note C - Contract Receivables (Details)	Dec. 31, 2013
Receivables [Abstract]
Majority Of Unbilled Receivables Will Be Substantially Billed And Collected	1 year

Note C - Contract Receivables (Details) - Summary of Contract Receivables - USD ($) $ in Thousands	Dec. 31, 2013	Dec. 31, 2012
Summary of Contract Receivables [Abstract]
Billed	$ 102,995	$ 133,014
Unbilled	96,243	66,814
Retainages	3,914	3,654
Other	3,663	2,904
Allowance for doubtful accounts	(1,753)	(1,448)
Contract receivables, net	$ 205,062	$ 204,938

Note D - Property and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Abstract]
Depreciation	$ 11.2	$ 9.8	$ 10.3

Note D - Property and Equipment (Details) - Property and Equipment - USD ($) $ in Thousands	Dec. 31, 2013	Dec. 31, 2012
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 9,224	$ 6,379
Software and Software Development Costs [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	27,677	24,948
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	17,127	15,174
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	25,415	23,466
Property and equipment, gross	79,443	69,967
Accumulated depreciation and amortization	(49,229)	(41,107)
Total property and equipment, net	$ 30,214	$ 28,860

Note E - Goodwill and Other Intangible Assets (Details)	12 Months Ended
Note E - Goodwill and Other Intangible Assets (Details)	Dec. 31, 2013
Minimum [Member]
Note E - Goodwill and Other Intangible Assets (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year
Maximum [Member]
Note E - Goodwill and Other Intangible Assets (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life	10 years
Weighted Average [Member] \| Customer-Related Intangible Assets [Member]
Note E - Goodwill and Other Intangible Assets (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years 146 days
Weighted Average [Member] \| Technology-Based Intangible Assets [Member]
Note E - Goodwill and Other Intangible Assets (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years 292 days
Weighted Average [Member]
Note E - Goodwill and Other Intangible Assets (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years 146 days

Note E - Goodwill and Other Intangible Assets (Details) - Changes in Carrying Amount of Goodwill - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Ironworks [Member]
Goodwill [Line Items]
Goodwill acquired during period		$ 119
GHK [Member]
Goodwill [Line Items]
Goodwill acquired during period	$ (101)	7,857
Symbiotic Engineering [Member]
Goodwill [Line Items]
Goodwill acquired during period		1,473
ECA [Member]
Goodwill [Line Items]
Goodwill acquired during period	8,357
Balance as of January 1	410,583	401,134
Balance as of December 31	$ 418,839	$ 410,583

Note E - Goodwill and Other Intangible Assets (Details) - Other Intangible Assets - USD ($) $ in Thousands	Dec. 31, 2013	Dec. 31, 2012
Customer-Related Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	$ 58,829	$ 58,204
Developed Technology Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross	960	3,237
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Other intangible assets, gross		814
Other intangible assets, gross	59,789	62,255
Less: accumulated amortization	(47,550)	(41,239)
Total other intangible assets, net	$ 12,239	$ 21,016

Note E - Goodwill and Other Intangible Assets (Details) - Estimated Future Amortization Expense Related to Intangible Assets $ in Thousands	Dec. 31, 2013 USD ($)
Estimated Future Amortization Expense Related to Intangible Assets [Abstract]
2014	$ 5,737
2015	3,012
2016	1,719
2017	1,024
2018	519
Thereafter	228
	$ 12,239

Note F - Business Combinations (Details) - USD ($) $ in Millions	1 Months Ended
	Jul. 31, 2013	Sep. 30, 2012	Feb. 29, 2012	Dec. 31, 2011
ECA [Member]
Note F - Business Combinations (Details) [Line Items]
Business Acquisition, Effective Date of Acquisition	Jul. 31, 2013
Symbiotic Engineering [Member]
Note F - Business Combinations (Details) [Line Items]
Business Acquisition, Effective Date of Acquisition		Sep. 30, 2012
GHK [Member]
Note F - Business Combinations (Details) [Line Items]
Business Acquisition, Effective Date of Acquisition			Feb. 29, 2012
Ironworks [Member]
Note F - Business Combinations (Details) [Line Items]
Payments to Acquire Businesses, Gross (in Dollars)				$ 101.9

Note F - Business Combinations (Details) - Unaudited Condensed Pro Forma Information $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2011 USD ($) $ / shares
Unaudited Condensed Pro Forma Information [Abstract]
Revenue	$ 898,528
Operating income	63,061
Net income	$ 36,309
Earnings per share:
Basic earnings per share (in Dollars per share) \| $ / shares	$ 1.84
Diluted earnings per share (in Dollars per share) \| $ / shares	$ 1.82

Note G - Accrued Salaries and Benefits (Details) - Accrued Salaries and Benefits - USD ($) $ in Thousands	Dec. 31, 2013	Dec. 31, 2012
Accrued Salaries and Benefits [Abstract]
Accrued paid time off (“PTO”) and leave	$ 7,769	$ 10,064
Accrued salaries	18,707	17,427
Accrued bonuses and commissions	10,335	7,032
Accrued medical	3,238	2,995
Other	5,945	4,746
Total accrued salaries and benefits	$ 45,994	$ 42,264

Note H - Accrued Expenses (Details) - Accrued Expenses - USD ($) $ in Thousands	Dec. 31, 2013	Dec. 31, 2012
Accrued Expenses [Abstract]
Accrued subcontractor and other direct costs	$ 19,480	$ 16,949
Deposits	3,530	5,732
Accrued IT and software licensing costs	4,173	3,008
Accrued insurance premiums	1,454	1,382
Accrued professional services	1,120	857
Other accrued expenses	2,499	3,851
Total accrued expenses	$ 32,256	$ 31,779

Note I - Long-Term Debt (Details)	12 Months Ended
Note I - Long-Term Debt (Details)	Dec. 31, 2013
Minimum [Member]
Note I - Long-Term Debt (Details) [Line Items]
Line Of Credit Facility, Fixed Charge Coverage Ratio, Covenant	1.25
Line of Credit Facility, Interest Rate During Period	1.42%
Maximum [Member]
Note I - Long-Term Debt (Details) [Line Items]
Line Of Credit Facility, Leverage Ratio Covenant	3.75
Line of Credit Facility, Interest Rate During Period	1.46%

Note I - Long-Term Debt (Details) - Long-Term Debt (Parentheticals)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Minimum [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Interest base rate	3.25%	3.25%

Note J - Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Note J - Income Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Foreign Tax Authority [Member]
Note J - Income Taxes (Details) [Line Items]
Operating Loss Carryforwards	$ 1,600	$ 1,400
Tax Credit Carryforward, Amount	1,600
Deferred Tax Assets, Valuation Allowance	500	500
State and Local Jurisdiction [Member]
Note J - Income Taxes (Details) [Line Items]
Tax Credit Carryforward, Amount	1,000
Deferred Tax Assets, Tax Credit Carryforwards	$ 712
Open Tax Year Subject To Examination	2008 to 2013
Deferred Tax Assets, Valuation Allowance	$ 513	463
Unrecognized Tax Benefits	702	1,091	$ 1,061	$ 944
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	200	600
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	200	$ 400
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$ (400)

Note J - Income Taxes (Details) - Income Tax Expense Components - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current:
Federal	$ 15,154	$ 7,730	$ 20,632
State	3,247	1,328	4,274
Foreign	1,651	1,184	801
	20,052	10,242	25,707
Deferred:
Federal	2,523	10,977	(3,173)
State	323	2,550	(630)
Foreign	(2)	67	(9)
	2,844	13,594	(3,812)
Income Tax Expense	$ 22,896	$ 23,836	$ 21,895

Note J - Income Taxes (Details) - Deferred Tax Assets (Liabilities) - USD ($) $ in Thousands	Dec. 31, 2013	Dec. 31, 2012
State and Local Jurisdiction [Member]
Non-current:
State tax credits	$ 712
Stock option compensation	503	$ 214
Allowance for bad debt	687	573
Accrued PTO	2,647	3,026
Accrued bonus	524	408
Foreign tax credits	642	174
Accrued liabilities	1,474	202
Total current deferred tax asset	6,477	4,597
Foreign net operating loss (NOL) carry forward	784	548
Stock option compensation	2,237	3,497
Deferred rent	4,096	3,303
Deferred compensation	2,273	1,783
Foreign tax credits	947	1,047
Other	2,592	1,892
Total non-current deferred tax assets	13,641	12,070
Less: Valuation Allowance	(513)	(463)
Total Deferred Tax Assets	19,605	16,204
Current:
Retention	(1,319)	(1,228)
Section 481(a) adjustment		(674)
Prepaids	(946)	(1,400)
Payroll taxes	(819)	(766)
Unbilled revenue	(9,449)	(6,319)
Other	(88)
Total current deferred liability	(12,621)	(10,387)
Non-current:
Depreciation	(4,751)	(5,715)
Amortization	(19,022)	(14,615)
Other	(135)	(358)
Total non-current deferred tax liabilities	(23,908)	(20,688)
Total Deferred Tax Liabilities	(36,529)	(31,075)
Total Net Deferred Tax Liability	$ (16,924)	$ (14,871)

Note J - Income Taxes (Details) - Unrecognized Tax Benefit Reconciliation - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Unrecognized Tax Benefit Reconciliation [Abstract]
Unrecognized tax benefits	$ 702	$ 1,091	$ 1,061	$ 944
Increase attributable to tax positions taken during the current period			$ 117
Increase attributable to tax positions taken during a prior period	43	78
Decrease attributable to lapse of statute of limitations	(424)	$ (48)
Decrease attributable to settlements	$ (8)

Note J - Income Taxes (Details) - Effective Income Tax Rate Reconciliation	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Effective Income Tax Rate Reconciliation [Abstract]
Taxes at statutory rate	35.00%	35.00%	35.00%
State taxes, net of federal benefit	4.20%	4.60%	4.60%
Foreign tax rate differential and U.S. unrepatriated earnings	(0.30%)	(0.30%)	0.00%
Other permanent differences	0.70%	0.80%	0.60%
Prior year tax adjustments and changes in unrecognized tax benefits	(2.10%)	(0.90%)	(1.20%)
Tax credits	(0.70%)	(0.70%)	(0.40%)
	36.80%	38.50%	38.60%

Note K - Accounting for Stock-Based Compensation (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Employee Stock Option [Member] \| Minimum [Member]
Note K - Accounting for Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term		5 years 36 days
Employee Stock Option [Member] \| Maximum [Member]
Note K - Accounting for Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term		5 years 146 days
Minimum [Member]
Note K - Accounting for Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Forfeiture Rate	4.67%
Maximum [Member]
Note K - Accounting for Stock-Based Compensation (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Forfeiture Rate	9.77%

Note K - Accounting for Stock-Based Compensation (Details) - Outstanding Stock Option Activity - Employee Stock Option [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Note K - Accounting for Stock-Based Compensation (Details) - Outstanding Stock Option Activity [Line Items]
Outstanding at January 1, 2011	638,800	460,653	392,369
Outstanding at January 1, 2011 (in Dollars per share)	$ 22.21	$ 20.50	$ 19.32
Shares, Exercised	(159,309)	(11,521)	(39,487)
Weighted Average Exercise Price, Exercised (in Dollars per share)	$ 19.48	$ 6.73	$ 12.11
Shares, Granted	218,707	203,436	190,552
Weighted Average Exercise Price, Granted (in Dollars per share)	$ 27.03	$ 25.39	$ 21.77
Shares, Forfeited/Expired	(3,646)	(13,768)	(82,781)
Weighted Average Exercise Price, Forfeited/Expired (in Dollars per share)	$ 24.84	$ 24.58	$ 21.85
Shares, Outstanding	694,552	638,800	460,653
Weighted Average Exercise Price, Outstanding (in Dollars per share)	$ 24.34	$ 22.21	$ 20.50
Aggregate Intrinsic Value, Outstanding (in Dollars)	$ 7,203
Vested plus expected to vest at December 31, 2013	678,431
Vested plus expected to vest at December 31, 2013 (in Dollars per share)	$ 24.29
Vested plus expected to vest at December 31, 2013 (in Dollars)	$ 7,069
Exercisable at December 31, 2013	291,251
Exercisable at December 31, 2013 (in Dollars per share)	$ 22.35
Exercisable at December 31, 2013 (in Dollars)	$ 3,600

Note K - Accounting for Stock-Based Compensation (Details) - Stock Options Outstanding, by Exercise Price Range	12 Months Ended
	Dec. 31, 2013 $ / shares shares
Price Range 1 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 9.05
Range of Exercise Prices, Upper Limit	$ 25.00
Number Outstanding	6 years 73 days
Weighted Average Remaining Contractual Term	$ 21.70
Weighted Average Exercise Price, Outstanding (in Shares) \| shares	241,765
Number Exercisable	$ 21.67
Weighted Average Exercise Price, Exercisable (in Shares) \| shares	306,472
Price Range 2 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 25.01
Range of Exercise Prices, Upper Limit	$ 27.00
Number Outstanding	8 years 76 days
Weighted Average Remaining Contractual Term	$ 25.66
Weighted Average Exercise Price, Outstanding (in Shares) \| shares	49,486
Number Exercisable	$ 25.66
Weighted Average Exercise Price, Exercisable (in Shares) \| shares	169,373
Price Range 3 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 27.01
Range of Exercise Prices, Upper Limit	$ 28.00
Number Outstanding	9 years 76 days
Weighted Average Remaining Contractual Term	$ 27.03
Weighted Average Exercise Price, Exercisable (in Shares) \| shares	218,707
Price Range 4 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Limit	$ 9.05
Range of Exercise Prices, Upper Limit	$ 28.00
Number Outstanding	7 years 233 days
Weighted Average Remaining Contractual Term	$ 24.34
Weighted Average Exercise Price, Outstanding (in Shares) \| shares	291,251
Number Exercisable	$ 22.35
Weighted Average Exercise Price, Exercisable (in Shares) \| shares	694,552
Number Outstanding	10 years

Note K - Accounting for Stock-Based Compensation (Details) - Restricted Stock Activity - Restricted Stock [Member] - $ / shares	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Note K - Accounting for Stock-Based Compensation (Details) - Restricted Stock Activity [Line Items]
Non-vested restricted stock awards		36,139	34,664	3,396
Non-vested restricted stock awards (in Dollars per share)		$ 22.41	$ 24.23	$ 21.19
Granted	5,133	36,139	48,356
Granted (in Dollars per share)	$ 35.06	$ 22.41	$ 24.32
Vested	(35,958)	(34,664)	(17,088)
Vested (in Dollars per share)	$ 24.19	$ 24.23	$ 23.87
Forfeited	(5,314)
Forfeited (in Dollars per share)	$ 22.58

Note K - Accounting for Stock-Based Compensation (Details) - Restricted Stock Unit Activity - Restricted Stock Units (RSUs) [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Note K - Accounting for Stock-Based Compensation (Details) - Restricted Stock Unit Activity [Line Items]
Non-vested RSUs	756,188	848,591	769,019	653,324
Non-vested RSUs (in Dollars per share)	$ 25.13	$ 24.32	$ 23.67	$ 25.05
Non-vested RSUs (in Dollars)	$ 26,247
Restricted stock units expected to vest in the future	718,858
Restricted stock units expected to vest in the future (in Dollars per share)	$ 25.13
Restricted stock units expected to vest in the future (in Dollars)	$ 24,952
Granted	229,574	374,868	350,375
Granted (in Dollars per share)	$ 27.02	$ 25.42	$ 21.69
Vested	(288,258)	(230,632)	(176,251)
Vested (in Dollars per share)	$ 24.28	$ 24.66	$ 22.56
Cancelled	(33,719)	(64,664)	(58,429)
Cancelled (in Dollars per share)	$ 24.86	$ 24.24	$ 24.01

Note K - Accounting for Stock-Based Compensation (Details) - Cash-Settled Restricted Stock Unit Activity - Cash Settled RSUs [Member] $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2013 USD ($) $ / shares shares
Note K - Accounting for Stock-Based Compensation (Details) - Cash-Settled Restricted Stock Unit Activity [Line Items]
Non-vested CSRSUs at December 31 \| shares	200,299
Non-vested CSRSUs at December 31 (in Dollars per share) \| $ / shares	$ 28.23
Non-vested CSRSUs at December 31 (in Dollars) \| $	$ 6,952
CSRSUs expected to vest in the future \| shares	187,760
CSRSUs expected to vest in the future (in Dollars per share) \| $ / shares	$ 28.30
CSRSUs expected to vest in the future (in Dollars) \| $	$ 6,517
Granted \| shares	203,115
Granted (in Dollars per share) \| $ / shares	$ 27.84
Cancelled \| shares	(2,816)
Cancelled (in Dollars per share) \| $ / shares	$ 27.03

Note L - Fair Value Measurement (Details) - USD ($) $ in Millions	Dec. 31, 2013	Dec. 31, 2012
Disclosure Text Block [Abstract]
Liabilities, Fair Value Disclosure, Recurring	$ 2.8	$ 0.0

Note M - Earnings Per Share (Details) - shares	12 Months Ended
Note M - Earnings Per Share (Details) - shares	Dec. 31, 2013	Dec. 31, 2012
Earnings per Share: [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	173,168	1,945

Note M - Earnings Per Share (Details) - Dilutive Effect of Stock Options and Awards - shares shares in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Dilutive Effect of Stock Options and Awards [Abstract]
Basic weighted-average shares outstanding									19,755	19,663	19,684
Effect of potential exercise of stock options and unvested restricted stock and RSUs									431	294	244
Diluted weighted-average shares outstanding	20,233	20,165	19,996	19,875	19,690	19,770	19,971	20,082	20,186	19,957	19,928

Note N - Share Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2011
Disclosure Text Block Supplement [Abstract]
Stock Repurchase Program, Authorized Amount	$ 35.0		$ 35.0
Treasury Stock, Shares, Acquired (in Shares)		160,043
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share)		$ 33.46
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 29.6

Note O - Commitments and Contingencies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2013 USD ($) ft²	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Mar. 08, 2010 ft²
Corporate Office Lease [Member]
Note O - Commitments and Contingencies (Details) [Line Items]
Operating Leases, Future Minimum Payments Due	$ 89,300
Term of Lease	12 years
Land Subject to Ground Leases (in Square Feet) \| ft²				257,879
Additional Land Subject To Ground Leases (in Square Feet) \| ft²	53,157
Monthly Rent	$ 500
Percentage Of Annual Escalations Of Lease Rent	2.50%
Operating Leases, Future Minimum Payments Due	$ 265,131
Operating Leases, Rent Expense	$ 36,500	$ 35,600	$ 32,000
Operating Leases, Rent Expense, Sublease Rentals		$ 100	$ 200

Note O - Commitments and Contingencies (Details) - Future Minimum Rental Payments $ in Thousands	Dec. 31, 2013 USD ($)
Future Minimum Rental Payments [Abstract]
2014	$ 30,422
2015	31,627
2016	30,524
2017	29,250
2018	6,641
Thereafter	136,667
	$ 265,131

Note P - Employee Benefit Plans (Details) - USD ($)	12 Months Ended
Note P - Employee Benefit Plans (Details) - USD ($)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure Text Block Supplement [Abstract]
Maximum Defer Of Compensation Subject To Statutory Limitations Percentage	70.00%
Percentage Of Employer Matching Contributions Condition One	100.00%
Percentage Of Employee Entitled To Employer Matching Contribution Condition One	3.00%
Percentage Of Employer Matching Contributions Condition Two	50.00%
Percentage Of Employee Entitled To Employer Matching Contribution Condition Two	2.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount (in Dollars)	$ 12,000,000	$ 11,800,000	$ 10,300,000
Deferred Compensation Arrangement with Individual, Cash Awards Granted, Percentage	80.00%
Deferred Compensation On Performance Bonuses That Eligible Employee Percentage	100.00%
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage	100.00%
Employee Stock Purchase Plan Shares Authorized (in Shares)	1,000,000
Employee Stock Purchase Plan Annual Maximum Payroll Deduction (in Dollars)	$ 25,000
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date	5.00%
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in Shares)	23,457
Employee Stock Purchase Plan Number of Shares Available for Grant (in Shares)	834,599

Note Q - Supplemental Information (Details) - Allowance for Doubtful Accounts - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts [Abstract]
Balance at beginning of period	$ 1,448	$ 1,746	$ 1,922
Bad debt expense	112	336	(64)
Net recoveries (write-offs)	193	(634)	(112)
Balance at end of period	$ 1,753	$ 1,448	$ 1,746

Note R - Selected Quarterly Financial Data (Unaudited) (Details) - Quarterly Financial Data - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Data [Abstract]
Contract revenue	$ 229,759	$ 244,055	$ 241,568	$ 233,921	$ 231,979	$ 237,864	$ 239,649	$ 227,641	$ 949,303	$ 937,133	$ 840,775
Operating income	12,587	17,154	17,295	17,649	14,545	16,995	18,268	16,374	64,685	66,182	59,481
Net income	$ 7,756	$ 11,131	$ 10,331	$ 10,112	$ 9,219	$ 9,573	$ 10,346	$ 8,937	$ 39,330	$ 38,075	$ 34,865
Earnings per share:
Basic (in Dollars per share)	$ 0.39	$ 0.56	$ 0.52	$ 0.52	$ 0.47	$ 0.49	$ 0.52	$ 0.45	$ 1.99	$ 1.94	$ 1.77
Diluted (in Dollars per share)	$ 0.38	$ 0.55	$ 0.52	$ 0.51	$ 0.47	$ 0.48	$ 0.52	$ 0.45	$ 1.95	$ 1.91	$ 1.75
Weighted-average common shares outstanding
Basic (in Shares)	19,826	19,802	19,706	19,543	19,501	19,610	19,774	19,769
Diluted (in Shares)	20,233	20,165	19,996	19,875	19,690	19,770	19,971	20,082	20,186	19,957	19,928

Note S - Subsequent Events (Details)	1 Months Ended
Note S - Subsequent Events (Details)	Feb. 28, 2014
Subsequent Event [Member]
Note S - Subsequent Events (Details) [Line Items]
Business Acquisition, Effective Date of Acquisition	Feb. 28, 2014

Label	Element	Value
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	$ 14,400,000
Number of Reportable Segments	us-gaap_NumberOfReportableSegments	1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1	$ 1,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1	1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1	700,000
Accumulated Amortization, Deferred Finance Costs	us-gaap_AccumulatedAmortizationDeferredFinanceCosts	3,100,000
Accumulated Amortization, Deferred Finance Costs	us-gaap_AccumulatedAmortizationDeferredFinanceCosts	2,600,000
Allocated Share-based Compensation Expense	us-gaap_AllocatedShareBasedCompensationExpense	11,900,000
Allocated Share-based Compensation Expense	us-gaap_AllocatedShareBasedCompensationExpense	8,800,000
Allocated Share-based Compensation Expense	us-gaap_AllocatedShareBasedCompensationExpense	6,700,000
Goodwill, Impairment Loss	us-gaap_GoodwillImpairmentLoss	0
Deferred Finance Costs, Net	us-gaap_DeferredFinanceCostsNet	4,600,000
Deferred Finance Costs, Net	us-gaap_DeferredFinanceCostsNet	4,600,000
LineOfCreditFacilityAccordionFeatureAdditionalRevolvingCreditCommitmentsUnderExistingLoanFacility	icfi_LineOfCreditFacilityAccordionFeatureAdditionalRevolvingCreditCommitmentsUnderExistingLoanFacility	100,000,000
Letters of Credit Outstanding, Amount	us-gaap_LettersOfCreditOutstandingAmount	3,000,000
Letters of Credit Outstanding, Amount	us-gaap_LettersOfCreditOutstandingAmount	2,900,000
Debt Issuance Cost	us-gaap_DebtIssuanceCosts	$ 2,000,000
Line of Credit Facility, Expiration Date	us-gaap_LineOfCreditFacilityExpirationDate1	Mar. 14, 2017
Line of Credit Facility, Current Borrowing Capacity	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity	$ 314,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	6 years 109 days
Line of Credit Facility, Remaining Borrowing Capacity	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity	$ 357,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageRemainingContractualTerm1	7 years 219 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	$ 9.37
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	9.77
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	$ 9.18
LineOfCreditFacilityStatedBorrowingPeriod	icfi_LineOfCreditFacilityStatedBorrowingPeriod	5 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions	$ 2,200,000
LineOfCreditFacilityMaximumBorrowingCapacityWithoutBorrowingBaseRequirement	icfi_LineOfCreditFacilityMaximumBorrowingCapacityWithoutBorrowingBaseRequirement	$ 400,000,000
CreditFacilitySyndicationNumberOfCommercialBanks	icfi_CreditFacilitySyndicationNumberOfCommercialBanks	11
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	1 year 292 days
Foreign Financial Institutions, Actual Deposits	us-gaap_ForeignFinancialInstitutionsActualDeposits	$ 5,300,000
Foreign Financial Institutions, Actual Deposits	us-gaap_ForeignFinancialInstitutionsActualDeposits	$ 7,300,000
Omnibus Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized	1,800,000
EquivalentShareDeductedForEveryOneShareDelivered	icfi_EquivalentShareDeductedForEveryOneShareDelivered	1.93
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	3,550,000
Line of Credit [Member]
Revolving Line of Credit/Swing Line. Outstanding borrowings bear daily interest at a base rate (based on the U.S. Prime Rate, which was 3.25% at December 31, 2013 and December 31, 2012, plus a spread) or LIBOR (1, 3, or 6 month rates) plus a spread, payable monthly	us-gaap_LongTermDebtCurrent	$ 40,000,000
Revolving Line of Credit/Swing Line. Outstanding borrowings bear daily interest at a base rate (based on the U.S. Prime Rate, which was 3.25% at December 31, 2013 and December 31, 2012, plus a spread) or LIBOR (1, 3, or 6 month rates) plus a spread, payable monthly	us-gaap_LongTermDebtCurrent	105,000,000
HHS [Member]
Accounts Receivable, Net	us-gaap_AccountsReceivableNet	11,800,000
Accounts Receivable, Net	us-gaap_AccountsReceivableNet	21,300,000
Gross Revenue	us-gaap_Revenues	173,700,000
Gross Revenue	us-gaap_Revenues	180,100,000
Gross Revenue	us-gaap_Revenues	184,500,000
Amended Agreement [Member]
Line of Credit Facility, Maximum Borrowing Capacity	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity	500,000,000
Previous Agreement [Member]
Line of Credit Facility, Maximum Borrowing Capacity	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity	$ 350,000,000
Sales Revenue, Services, Net [Member] \| HHS [Member]
Revenue by contract type, percentage	us-gaap_ConcentrationRiskPercentage1	18.00%
Revenue by contract type, percentage	us-gaap_ConcentrationRiskPercentage1	19.00%
Revenue by contract type, percentage	us-gaap_ConcentrationRiskPercentage1	22.00%
Sales Revenue, Services, Net [Member] \| United States Government [Member]
Revenue by contract type, percentage	us-gaap_ConcentrationRiskPercentage1	58.00%
Revenue by contract type, percentage	us-gaap_ConcentrationRiskPercentage1	60.00%
Revenue by contract type, percentage	us-gaap_ConcentrationRiskPercentage1	66.00%
Other Assets [Member]
Finite-Lived Intangible Asset, Useful Life	us-gaap_FiniteLivedIntangibleAssetUsefulLife	5 years
Capitalized Computer Software, Gross	us-gaap_CapitalizedComputerSoftwareGross	$ 1,600,000
Capitalized Computer Software, Gross	us-gaap_CapitalizedComputerSoftwareGross	1,500,000
Capitalized Computer Software, Amortization	us-gaap_CapitalizedComputerSoftwareAmortization	300,000
Capitalized Computer Software, Amortization	us-gaap_CapitalizedComputerSoftwareAmortization	300,000
Capitalized Computer Software, Amortization	us-gaap_CapitalizedComputerSoftwareAmortization	300,000
Cash Settled RS Us [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions	5,300,000
Allocated Share-based Compensation Expense	us-gaap_AllocatedShareBasedCompensationExpense	$ 1,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1	4 years
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestAggregateIntrinsicValue	icfi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestAggregateIntrinsicValue	$ 6,500,000
Share Price	us-gaap_SharePrice	$ 34.71
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	3 years 109 days
Options Restricted Stock And RS Us [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	2,100,000
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum	1.10%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum	0.70%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum	42.30%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	$ 2,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	$ 500,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	5 years 146 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	5 years 219 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	36.80%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	42.30%
Allocated Share-based Compensation Expense	us-gaap_AllocatedShareBasedCompensationExpense	$ 1,600,000
Allocated Share-based Compensation Expense	us-gaap_AllocatedShareBasedCompensationExpense	1,400,000
Allocated Share-based Compensation Expense	us-gaap_AllocatedShareBasedCompensationExpense	$ 1,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum	41.00%
Share Price	us-gaap_SharePrice	$ 34.71
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.90%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	2.20%
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	2 years 73 days
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	$ 900,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	800,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	400,000
Allocated Share-based Compensation Expense	us-gaap_AllocatedShareBasedCompensationExpense	400,000
Allocated Share-based Compensation Expense	us-gaap_AllocatedShareBasedCompensationExpense	800,000
Allocated Share-based Compensation Expense	us-gaap_AllocatedShareBasedCompensationExpense	800,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	7,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	5,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue	4,000,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions	12,200,000
Allocated Share-based Compensation Expense	us-gaap_AllocatedShareBasedCompensationExpense	8,700,000
Allocated Share-based Compensation Expense	us-gaap_AllocatedShareBasedCompensationExpense	6,600,000
Allocated Share-based Compensation Expense	us-gaap_AllocatedShareBasedCompensationExpense	$ 4,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1	4 years
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestAggregateIntrinsicValue	icfi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestAggregateIntrinsicValue	$ 25,000,000
Share Price	us-gaap_SharePrice	$ 34.71
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	2 years