Entity Central Index Key Cover [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Shell Company Entity Shell Company Document Annual Report Document Annual Report Document Transition Report Document Transition Report Entity Current Reporting Status Entity Current Reporting Status Entity Voluntary Filers Entity Voluntary Filers Entity Interactive Data Current Entity Interactive Data Current Entity Well-known Seasoned Issuer Entity Well Known Seasoned Issuer Entity Common Stock, Shares Outstanding (in shares) Entity Common Stock Shares Outstanding Entity Public Float Entity Public Float Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity File Number Entity File Number Entity Tax Identification Number Entity Tax Identification Number Entity Incorporation State Country Code Entity Incorporation State Country Code Entity Address, Address Line One Entity Address Address Line1 Entity Address, City or Town Entity Address City Or Town Entity Address, State or Province Entity Address State Or Province Entity Address, Postal Zip Code Entity Address Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Title of each class Security12b Title Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Represents accrued subcontractor and other direct costs. Statement Of Financial Position [Abstract] ASSETS Assets [Abstract] Current Assets: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Contract receivables, net Accounts Receivable Net Current Contract assets Contract With Customer Asset Net Current Prepaid expenses and other Prepaid Expense And Other Assets Current Income tax receivable Income Taxes Receivable Total Current Assets Assets Current Total Property and Equipment, net Property Plant And Equipment Net Other Assets: Other Assets [Abstract] Restricted cash - non-current Restricted Cash Noncurrent Goodwill Goodwill Other intangible assets, net Intangible Assets Net Excluding Goodwill Operating lease - right-of-use assets Operating Lease Right Of Use Asset Other assets Other Assets Noncurrent Total Assets Assets LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities And Stockholders Equity [Abstract] Current Liabilities: Liabilities Current [Abstract] Accounts payable Accounts Payable Current Contract liabilities Contract With Customer Liability Current Operating lease liabilities - current Operating Lease Liability Current Accrued salaries and benefits Employee Related Liabilities Current Accrued subcontractors and other direct costs Accrued Subcontractor And Other Direct Costs Accrued expenses and other current liabilities Accrued Liabilities And Other Liabilities Total Current Liabilities Liabilities Current Long-term Liabilities: Liabilities Noncurrent [Abstract] Long-term debt Long Term Debt Noncurrent Operating lease liabilities - non-current Operating Lease Liability Noncurrent Deferred rent Deferred Rent Credit Noncurrent Deferred income taxes Deferred Tax Liabilities Noncurrent Other Other Liabilities Noncurrent Total Liabilities Liabilities Contingencies (Note 20) Commitments And Contingencies Stockholders’ Equity: Stockholders Equity [Abstract] Preferred stock, par value $.001 per share; 5,000,000 shares authorized; none issued Preferred Stock Value Common stock, $.001 par value; 70,000,000 shares authorized; 22,846,374 and 22,445,576 shares issued; and 18,867,555 and 18,817,495 shares outstanding at December 31, 2019 and December 31, 2018, respectively Common Stock Value Additional paid-in capital Additional Paid In Capital Common Stock Retained earnings Retained Earnings Accumulated Deficit Treasury stock, 3,978,819 and 3,628,081 shares at December 31, 2019 and 2018, respectively Treasury Stock Value Accumulated other comprehensive loss Accumulated Other Comprehensive Income Loss Net Of Tax Total Stockholders’ Equity Stockholders Equity Total Liabilities and Stockholders’ Equity Liabilities And Stockholders Equity Preferred stock, par value (in dollars per share) Preferred Stock Par Or Stated Value Per Share Preferred stock, shares authorized (in shares) Preferred Stock Shares Authorized Preferred stock, shares issued (in shares) Preferred Stock Shares Issued Common stock, par value (in dollars per share) Common Stock Par Or Stated Value Per Share Common stock, authorized (in shares) Common Stock Shares Authorized Common stock, issued (in shares) Common Stock Shares Issued Common stock, outstanding (in shares) Common Stock Shares Outstanding Treasury stock, shares (in shares) Treasury Stock Shares Amortization of intangible asset. Income Statement [Abstract] Revenue Revenue From Contract With Customer Excluding Assessed Tax Direct costs Cost Of Goods And Services Sold Operating costs and expenses Operating Expenses [Abstract] Indirect and selling expenses Selling General And Administrative Expense Depreciation and amortization Depreciation And Amortization Amortization of intangible assets Amortization Of Intangible Asset Total operating costs and expenses Operating Expenses Operating income Operating Income Loss Interest expense Interest Expense Other (expense) income Other Nonoperating Income Expense Income before income taxes Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Provision for income taxes Income Tax Expense Benefit Net income Net Income Loss Earnings per share: Earnings Per Share [Abstract] Basic Earnings Per Share Basic Diluted Earnings Per Share Diluted Weighted-average common shares outstanding: Weighted Average Number Of Shares Outstanding Diluted Disclosure Items [Abstract] Basic Weighted Average Number Of Shares Outstanding Basic Diluted Weighted Average Number Of Diluted Shares Outstanding Cash dividends declared per common share Common Stock Dividends Per Share Declared Other comprehensive income (loss), net of tax Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Comprehensive income, net of tax Comprehensive Income Net Of Tax Number of shares, net, of stockholders' issuance and buyback, including RSA grant and treasury stock. Equity impact of the value of stockholders' issuance and buybacks, including RSA grant and treasury stock. Statement Of Stockholders Equity [Abstract] Statement [Table] Statement [Table] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-in Capital Additional Paid In Capital [Member] Retained Earnings Retained Earnings [Member] Treasury Stock Treasury Stock [Member] Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income [Member] Statement [Line Items] Statement [Line Items] Balance Balance (in shares) Shares Issued Net income Other comprehensive income (loss) Equity compensation Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Exercise of stock options Stock Issued During Period Value Stock Options Exercised Exercise of stock options (in shares) Stock Issued During Period Shares Stock Options Exercised Issuance of shares pursuant to vesting of restricted stock units Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures Issuance of shares pursuant to vesting of restricted stock units (in shares) Stock Issued During Period Shares Restricted Stock Award Net Of Forfeitures Net payments for stock issuances and buybacks Net Payments For Stock Holder Issuance And Buy Backs Shares Value Net payments for stock issuances and buybacks (in shares) Net Payments For Stockholder Issuances And Buybacks Shares Reclassification of stranded tax effects due to adoption of accounting principle Tax Cuts And Jobs Act Of2017 Reclassification From Aoci To Retained Earnings Tax Effect Dividends declared Dividends Common Stock Cash Balance Balance (in shares) Represents the amount of facilities consolidation reserve recorded during the period. Increase Decrease in accrued subcontractor and other direct costs. The cash outflow for the repayment of financed capital expenditures. Statement Of Cash Flows [Abstract] Cash Flows from Operating Activities Net Cash Provided By Used In Operating Activities [Abstract] Net income Profit Loss Adjustments to reconcile net income to net cash provided by operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Bad debt expense Provision For Doubtful Accounts Deferred income taxes Increase Decrease In Deferred Income Taxes Non-cash equity compensation Share Based Compensation Depreciation and amortization Depreciation Depletion And Amortization Deferred rent Straight Line Rent Facilities consolidation reserve Facilities Consolidation Reserve Remeasurement of contingent acquisition liability Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 Amortization of debt issuance costs Amortization Of Financing Costs Impairment of long-lived assets Impairment Of Long Lived Assets Held For Use Other adjustments, net Other Noncash Income Expense Changes in operating assets and liabilities, net of the effect of acquisitions: Increase Decrease In Operating Capital [Abstract] Net contract assets and liabilities Increase Decrease In Commodity Contract Assets And Liabilities Contract receivables Increase Decrease In Receivables Prepaid expenses and other assets Increase Decrease In Prepaid Deferred Expense And Other Assets Accounts payable Increase Decrease In Accounts Payable Accrued salaries and benefits Increase Decrease In Employee Related Liabilities Accrued subcontractors and other direct costs Increase Decrease In Accrued Subcontractor And Other Direct Costs Accrued expenses and other current liabilities Increase Decrease In Accrued Liabilities And Other Operating Liabilities Income tax receivable and payable Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable Other liabilities Increase Decrease In Other Operating Liabilities Net Cash Provided by Operating Activities Net Cash Provided By Used In Operating Activities Cash Flows from Investing Activities Net Cash Provided By Used In Investing Activities [Abstract] Capital expenditures for property and equipment and capitalized software Payments To Acquire Productive Assets Payments for business acquisitions, net of cash received Payments To Acquire Businesses Net Of Cash Acquired Net Cash Used in Investing Activities Net Cash Provided By Used In Investing Activities Cash Flows from Financing Activities Net Cash Provided By Used In Financing Activities [Abstract] Advances from working capital facilities Proceeds From Bank Debt Payments on working capital facilities Repayments Of Long Term Debt Payments on capital expenditure obligations Repayment Of Capital Expenditure Obligations Debt issue costs Payments Of Debt Issuance Costs Proceeds from exercise of options Proceeds From Stock Options Exercised Dividends paid Payments Of Dividends Common Stock Net payments for stockholder issuances and buybacks Payments For Repurchase Of Equity Net Cash Used in Financing Activities Net Cash Provided By Used In Financing Activities Effect of Exchange Rate Changes on Cash, Cash Equivalents, and Restricted Cash Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations (Decrease) Increase in Cash, Cash Equivalents, and Restricted Cash Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect Cash, Cash Equivalents, and Restricted Cash, Beginning of Period Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations Cash, Cash Equivalents, and Restricted Cash, End of Period Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Interest Interest Paid Net Income taxes Income Taxes Paid Non-cash investing and financing transactions: Noncash Investing And Financing Items [Abstract] Deferred and contingent consideration arising from businesses acquired Noncash Or Part Noncash Acquisition Value Of Liabilities Assumed1 Capital expenditure obligations Capital Expenditures Incurred But Not Yet Paid Documents Incorporated by Reference Documents Incorporated By Reference [Text Block] Organization Consolidation And Presentation Of Financial Statements [Abstract] Basis of Presentation and Nature of Operations Organization Consolidation And Presentation Of Financial Statements Disclosure [Text Block] Accounting Policies [Abstract] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Receivables [Abstract] Contract Receivables Loans Notes Trade And Other Receivables Disclosure [Text Block] Property Plant And Equipment [Abstract] Property and Equipment Property Plant And Equipment Disclosure [Text Block] Goodwill And Intangible Assets Disclosure [Abstract] Goodwill and Other Intangible Assets Goodwill And Intangible Assets Disclosure [Text Block] Leases [Abstract] Leases Lessee Operating Leases [Text Block] Employee Related Liabilities Current [Abstract] Accrued Salaries and Benefits Compensation Related Costs General [Text Block] Payables And Accruals [Abstract] Accrued Expenses and Other Current Liabilities Accounts Payable And Accrued Liabilities Disclosure [Text Block] Debt Disclosure [Abstract] Long-Term Debt Long Term Debt [Text Block] Revenue From Contract With Customer [Abstract] Revenue Recognition Revenue From Contract With Customer [Text Block] Derivative Instruments And Hedging Activities Disclosure [Abstract] Derivative instruments and Hedges Activities Derivative Instruments And Hedging Activities Disclosure [Text Block] Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract] Accumulated Other Comprehensive Loss Comprehensive Income Note [Text Block] Cash And Cash Equivalents [Abstract] Restricted Cash Cash And Cash Equivalents Disclosure [Text Block] Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Accounting for Stock-based Compensation Disclosure Of Compensation Related Costs Share Based Payments [Text Block] Business Combinations [Abstract] Business Combinations Business Combination Disclosure [Text Block] Earnings Per Share Earnings Per Share [Text Block] Equity [Abstract] Share Repurchase Program Treasury Stock [Text Block] Fair Value Disclosures [Abstract] Fair Value Fair Value Disclosures [Text Block] Commitments And Contingencies Disclosure [Abstract] Contingencies Commitments And Contingencies Disclosure [Text Block] Employee Benefit Plans Compensation And Employee Benefit Plans [Text Block] Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Disclosure Text Block Supplement [Abstract] Supplemental Information Financing Receivables [Text Block] Quarterly Financial Information Disclosure [Abstract] Quarterly Financial Information Quarterly Financial Information [Text Block] Basis of Presentation Basis Of Accounting Policy Policy [Text Block] Use of Estimates Use Of Estimates Revenue Recognition Revenue Recognition Policy [Text Block] Cash and Cash Equivalents Cash And Cash Equivalents Policy [Text Block] Restricted Cash Cash And Cash Equivalents Restricted Cash And Cash Equivalents Policy Property and Equipment Property Plant And Equipment Policy [Text Block] Goodwill and Other Intangible Assets Goodwill And Intangible Assets Goodwill Policy Impairment Impairment Or Disposal Of Long Lived Assets Including Intangible Assets Policy Policy [Text Block] Long-Lived Assets Impairment Or Disposal Of Long Lived Assets Policy [Text Block] Leases Lessee Leases Policy [Text Block] Capitalized Software Research Development And Computer Software Policy [Text Block] Stock-based Compensation Share Based Compensation Option And Incentive Plans Policy Derivative Instruments Derivatives Methods Of Accounting Hedging Derivatives Income Taxes Income Tax Policy [Text Block] Represents the treasury shares significant accounting policy. Treasury Shares Treasury Shares Policy [Text Block] Other Comprehensive Income (Loss) Comprehensive Income Policy Policy [Text Block] Disclosure of accounting policy for segments, customer, and geographic information. Segment, Customer and Geographic Information Segment Customer And Geographic Information Policy [Text Block] Risk and Uncertainties Concentration Risk Credit Risk Recent Accounting Pronouncements New Accounting Pronouncements Policy Policy [Text Block] Schedule of Impact to Consolidated Balance Sheets Before and After the Adoption Schedule Of New Accounting Pronouncements And Changes In Accounting Principles [Text Block] Summary of Contract Receivables Schedule Of Accounts Notes Loans And Financing Receivable [Text Block] Property and Equipment Property Plant And Equipment [Text Block] Schedule of Changes in Carrying Amount of Goodwill Schedule Of Goodwill [Text Block] Schedule of Other Intangibles Schedule Of Finite Lived Intangible Assets Table [Text Block] Schedule of Estimated Future Amortization Expense Relating to Intangible Assets Scheduleof Finite Lived Intangible Assets Future Amortization Expense Table [Text Block] Lessee operating leases. Summary of Operating Leases Lessee Operating Leases Table [Text Block] Summary of Rent Expense Lease Cost Table [Text Block] Summary of Future Minimum Lease Payments Under Non-Cancellable Leases Lessee Operating Lease Liability Maturity Table [Text Block] Schedule of other information related to operating leases. Summary of Other Information Related to Operating Leases Schedule Of Other Information Related To Operating Leases Table [Text Block] Summary of Rent Expense For Periods Prior to Adoption of New Lease Standard Operating Leases Of Lessee Disclosure [Text Block] Schedule of accrued employee benefits current. Schedule of Accrued Salaries and Benefits Schedule Of Accrued Employee Benefits Current Table [Text Block] Schedule of Accrued Expenses and Other Current Liabilities Schedule Of Accrued Liabilities Table [Text Block] Schedule of Long-term Debt Instruments Schedule Of Debt Instruments [Text Block] Schedule of Net Debt Issuance Costs Schedule Of Debt Table [Text Block] Disaggregation of Revenue Disaggregation Of Revenue Table [Text Block] Schedule of Contract Balances and Changes in Contract Balances Contract With Customer Asset And Liability Table [Text Block] Summary of Interest Rate Swaps Derivatives Designated as Cash Flow Hedges Schedule Of Interest Rate Derivatives Table [Text Block] Summary of Effect of Swaps on Company's Financial Statements Schedule Of Cash Flow Hedging Instruments Statements Of Financial Performance And Financial Position Location Table [Text Block] Income Before Income Taxes Schedule Of Income Before Income Tax Domestic And Foreign Table [Text Block] Income Tax Expense Components Schedule Of Components Of Income Tax Expense Benefit Table [Text Block] Deferred Tax Assets (Liabilities) Schedule Of Deferred Tax Assets And Liabilities Table [Text Block] Unrecognized Tax Benefit Reconciliation Schedule Of Unrecognized Tax Benefits Excluding Amounts Pertaining To Examined Tax Returns Roll Forward Table [Text Block] Effective Income Tax Rate Reconciliation Schedule Of Effective Income Tax Rate Reconciliation Table [Text Block] Components of Accumulated Other Comprehensive Loss Schedule Of Accumulated Other Comprehensive Income Loss Table [Text Block] Restricted Cash And Cash Equivalents Current [Abstract] Reconciliation of Cash and Cash Equivalents, and Restricted Cash Schedule Of Restricted Cash And Cash Equivalents [Text Block] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Award Type Award Type [Axis] Award Type Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Restricted Stock Units (RSUs) Restricted Stock Units R S U [Member] Represents cash settled RSUs. Cash Settled RSUs Cash Settled R S Us [Member] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Schedule of Stock-based Compensation Expense Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Text Block] Outstanding Stock Option Activity Schedule Of Share Based Compensation Stock Options Activity Table [Text Block] Schedule of Stock Options Outstanding by Exercise Price Range Schedule Of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range [Text Block] Schedule of Restricted Stock Unit Activity Schedule Of Sharebased Compensation Restricted Stock And Restricted Stock Units Activity Table [Text Block] Summary of Non-employee Director Awards Schedule Of Share Based Compensation Nonemployee Director Stock Award Plan Activity Table [Text Block] Summary of Performance Shares Activity Share Based Compensation Performance Shares Award Unvested Activity Table [Text Block] Schedule of Fair Value Assumptions using Monte Carlo Simulation Model for Awards Granted Schedule Of Share Based Payment Award Stock Options Valuation Assumptions Table [Text Block] Schedule of Dilutive Effect of Stock Options RSUs and PSAs Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Schedule of Financial Instruments Measured at Fair Value on Recurring Basis Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Table [Text Block] Schedule of Allowance for Doubtful Accounts Allowance For Credit Losses On Financing Receivables Table [Text Block] Schedule of Income Tax Valuation Allowance Summary Of Valuation Allowance [Text Block] Quarterly Financial Information Schedule Of Quarterly Financial Information Table [Text Block] The number of offices owned by the company. Basis of presentation and nature of operations. Basis of presentation and nature of operations. Basis Of Presentation And Nature Of Operations [Table] Basis Of Presentation And Nature Of Operations [Table] Geographical Statement Geographical [Axis] Geographical Segment Geographical [Domain] Domestic UNITED STATES International Non Us [Member] Statistical Measurement Range [Axis] Statistical Measurement Range [Member] Minimum Minimum [Member] Maximum Maximum [Member] Basis of Presentation and Nature of Operations [Line Items] Basis Of Presentation And Nature Of Operations [Line Items] Number of offices Number Of Offices Contracts payment term. Contract payment term description. Summary of significant accounting policies. Summary of significant accounting policies. Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Balance Sheet Location Balance Sheet Location [Axis] Balance Sheet Location Balance Sheet Location [Domain] Other Assets Other Assets [Member] Customer Major Customers [Axis] Customer Name Of Major Customer [Domain] Refers to information regarding the federal government agencies and departments. Federal Government Agencies And Departments Federal Government Agencies And Departments [Member] Concentration Risk Type Concentration Risk By Type [Axis] Concentration Risk Type Concentration Risk Type [Domain] Customer Concentration Risk Customer Concentration Risk [Member] Concentration Risk Benchmark Concentration Risk By Benchmark [Axis] Concentration Risk Benchmark Concentration Risk Benchmark [Domain] Sales Revenue, Net Sales Revenue Net [Member] Refers to information regarding international clients. International Clients International Clients [Member] Geographic Concentration Risk Geographic Concentration Risk [Member] Represents the international geographic location. International International [Member] Long-Lived Assets Property Plant And Equipment [Member] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Contract payment term description Contract Payment Term Description Contracts payment, term Contracts Payment Term Property and equipment, estimated useful life Property Plant And Equipment Useful Life Number of reportable segments Number Of Reporting Units Goodwill, impaired, accumulated impairment loss Goodwill Impaired Accumulated Impairment Loss Goodwill, impairment loss Goodwill Impairment Loss Finite-lived intangible asset, useful life Finite Lived Intangible Asset Useful Life Capitalized software, net of accumulated amortization Capitalized Computer Software Net Performance based share awards, performance period Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 Number of operating segments Number Of Operating Segments Concentration risk, percentage Concentration Risk Percentage1 Foreign financial institutions, actual deposits Foreign Financial Institutions Actual Deposits Adjustments for New Accounting Pronouncements Adjustments For New Accounting Pronouncements [Axis] Type of Adoption Type Of Adoption [Member] Accounting Standards Update 2016-02 Accounting Standards Update201602 [Member] Restatement Restatement [Axis] Restatement Restatement [Domain] Before Adoption Scenario Previously Reported [Member] Adoption Adjustments Restatement Adjustment [Member] Billed receivables Billed Contract Receivables Allowance for doubtful accounts Allowance For Doubtful Accounts Receivable Current Contract receivables, net Schedule Of Property Plant And Equipment [Table] Schedule Of Property Plant And Equipment [Table] Property, Plant and Equipment, Type Property Plant And Equipment By Type [Axis] Property, Plant and Equipment, Type Property Plant And Equipment Type [Domain] Leasehold Improvements Leasehold Improvements [Member] Software and Software Development Costs Software And Software Development Costs [Member] Furniture and Fixtures Furniture And Fixtures [Member] Computer Equipment Computer Equipment [Member] Property Plant And Equipment [Line Items] Property Plant And Equipment [Line Items] Property and equipment, gross Property Plant And Equipment Gross Accumulated depreciation and amortization Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Total property and equipment, net Depreciation and amortization expense Schedule Of Goodwill [Table] Schedule Of Goodwill [Table] Business Acquisition Business Acquisition [Axis] Business Acquisition, Acquiree Business Acquisition Acquiree [Domain] The Future Customer. The Future Customer The Future Customer [Member] DMS disaster consultants member. DMS Disaster Consultants D M S Disaster Consultants [Member] Vista Limited. Vista Limited Vista Limited [Member] Olson. Olson Olson [Member] Goodwill [Line Items] Goodwill [Line Items] Balance as of January 1 Goodwill resulting from business combinations Goodwill Purchase Accounting Adjustments Goodwill resulting from business combination Goodwill Subsequent Recognition Of Deferred Tax Asset Effect of foreign currency translation Goodwill Foreign Currency Translation Gain Loss Balance as of December 31 Weighted Average Weighted Average [Member] Finite-Lived Intangible Assets by Major Class Finite Lived Intangible Assets By Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name Finite Lived Intangible Assets Major Class Name [Domain] Customer Relationships Customer Relationships [Member] Technology-Based Intangible Assets Technology Based Intangible Assets [Member] Income Statement Location Income Statement Location [Axis] Income Statement Location Income Statement Location [Domain] Indirect and Selling Expenses Selling General And Administrative Expenses [Member] Customer-Related Intangible Assets Customer Related Intangible Assets [Member] Developed Technology Rights Developed Technology Rights [Member] Finite lived intangible assets, gross carrying value Finite Lived Intangible Assets Gross Accumulated amortization Finite Lived Intangible Assets Accumulated Amortization Finite lived intangible assets, net carrying value Finite Lived Intangible Assets Net Indefinite lived intangible assets, gross carrying value Indefinite Lived Intangible Assets Excluding Goodwill Total intangible assets, gross carrying value Intangible Assets Gross Excluding Goodwill Amortization of Intangible Assets Amortization Of Intangible Assets Impairment expense related to intangible assets Impairment Of Intangible Assets Finitelived 2020 Finite Lived Intangible Assets Amortization Expense Next Twelve Months 2021 Finite Lived Intangible Assets Amortization Expense Year Two 2022 Finite Lived Intangible Assets Amortization Expense Year Three 2023 Finite Lived Intangible Assets Amortization Expense Year Four 2024 Finite Lived Intangible Assets Amortization Expense Year Five Thereafter Finite Lived Intangible Assets Amortization Expense After Year Five Lessee operating lease remaining lease term. Lessee operating lease termination term. Lessee Lease Description [Table] Lessee Lease Description [Table] Lessee Lease Description [Line Items] Lessee Lease Description [Line Items] Operating leases, remaining lease term Lessee Operating Lease Remaining Lease Term Operating leases, extendable lease term Lessee Operating Lease Renewal Term Operating leases, option to extend lease Lessee Operating Lease Option To Extend Operating leases, existence of option to extend Lessee Operating Lease Existence Of Option To Extend Operating leases, termination lease term Lessee Operating Lease Termination Term Operating leases, option to terminate lease Lessee Operating Lease Option To Terminate Operating leases, existence of option to terminate Lessee Operating Lease Existence Of Option To Terminate Operating leases, residual value guarantee description Lessee Operating Lease Residual Value Guarantee Description Operating leases, existence of residual value guarantee Lessee Operating Lease Existence Of Residual Value Guarantee Operating lease right of use asset gross. Operating lease right of use asset amortization. Real estate facilities. Real Estate Facilities Real Estate Facilities [Member] Office Equipment Office Equipment [Member] Other. Other Other [Member] Operating lease right of use assets, gross Operating Lease Right Of Use Asset Gross Amortization of right-of-use assets Operating Lease Right Of Use Asset Amortization Total operating lease right-of-use assets Variable lease cost (benefit). Operating lease costs Operating Lease Cost Short-term lease costs Short Term Lease Cost Variable lease costs Variable Lease Cost Benefit Total rent expense Lease Cost December 31, 2020 Lessee Operating Lease Liability Payments Due Next Rolling Twelve Months December 31, 2021 Lessee Operating Lease Liability Payments Due In Rolling Year Two December 31, 2022 Lessee Operating Lease Liability Payments Due In Rolling Year Three December 31, 2023 Lessee Operating Lease Liability Payments Due In Rolling Year Four December 31, 2024 Lessee Operating Lease Liability Payments Due In Rolling Year Five Thereafter Lessee Operating Lease Liability Payments Due After Rolling Year Five Total future minimum lease payments Lessee Operating Lease Liability Payments Due Less: Interest Lessee Operating Lease Liability Undiscounted Excess Amount Total operating lease liabilities Operating Lease Liability Total operating lease liabilities Operating cash flows from operating leases Operating Lease Payments Right-of-use assets obtained in exchange for new operating lease liabilities Right Of Use Asset Obtained In Exchange For Operating Lease Liability Weighted-average remaining lease term - operating leases Operating Lease Weighted Average Remaining Lease Term1 Weighted-average discount rate - operating leases Operating Lease Weighted Average Discount Rate Percent Lessee operating lease lease not yet commenced amount. Lessee operating lease lease not yet possessed property and commenced term of contract. Additional operating leases not yet commenced, value Lessee Operating Lease Lease Not Yet Commenced Amount Additional operating leases not yet commenced, lease terms Lessee Operating Lease Lease Not Yet Commenced Term Of Contract1 Operating leases not yet possessed and commenced, lease term Lessee Operating Lease Lease Not Yet Possessed Property And Commenced Term Of Contract Rent Operating Leases Rent Expense Minimum Rentals Sublease income Operating Leases Rent Expense Sublease Rentals1 Total rent expense Operating Leases Rent Expense Net Accrued medical current. Accrued bonuses, liability-classified awards, and commissions Accrued Bonuses Current Accrued salaries Accrued Salaries Current Accrued paid time off and leave Accrued Vacation Current Accrued medical Accrued Medical Current Accrued payroll taxes and withholdings Accrued Payroll Taxes Current Other Other Employee Related Liabilities Current Total accrued salaries and benefits Represents accrued information technology and software licensing costs current. Accrued taxes and insurance premiums current. Accrued facilities rental and lease exit costs current. Accrued contingent and contractual liabilities current from acquisitions. Deposits Deposit Liability Current Accrued IT and software licensing costs Accrued Information Technology And Software Licensing Costs Current Accrued taxes and insurance premiums Accrued Taxes And Insurance Premiums Current Accrued facilities rental and lease exit costs Accrued Facilities Rental And Lease Exit Costs Current Accrued interest Interest Payable Current Accrued professional services Accrued Professional Fees Current Accrued dividends Dividends Payable Current Contingent and contractual liabilities from acquisitions Accrued Contingent And Contractual Liabilities Current From Acquisitions Other accrued expenses and current liabilities Other Accrued Liabilities Current Total accrued expenses and other current liabilities Accrued Liabilities Current Represents credit facility syndication number of commercial banks. Represents line of credit facility maximum borrowing capacity without borrowing base requirement. Represents line of credit facility accordion feature additional revolving credit commitments under existing loan facility. Represents the funds from new syndicated borrowings used to pay off or pay down borrowings from syndicate members. Debt Instrument [Table] Debt Instrument [Table] Variable Rate Variable Rate [Axis] Variable Rate Variable Rate [Domain] Federal Funds Open Rate Federal Funds Effective Swap Rate [Member] London Interbank Offered Rate (LIBOR) London Interbank Offered Rate L I B O R [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Credit facility syndication, number of commercial banks Credit Facility Syndication Number Of Commercial Banks Line of credit facility, expiration date Line Of Credit Facility Expiration Date1 Line of credit facility, maximum borrowing capacity without borrowing base requirement Line Of Credit Facility Maximum Borrowing Capacity Without Borrowing Base Requirement Line of credit facility, accordion feature, additional revolving credit commitments under existing loan facility Line Of Credit Facility Accordion Feature Additional Revolving Credit Commitments Under Existing Loan Facility New syndicated borrowings used to pay off or pay down borrowings from syndicate members New Syndicated Borrowings Used To Pay Off Or Pay Down Borrowings From Syndicate Members Represents the minimum interest coverage ratio under the credit facility's financial covenants. Represents the maximum leverage ratio under the line of credit facility covenant. Debt instrument, basis spread on variable rate Debt Instrument Basis Spread On Variable Rate1 Line of credit facility, maximum borrowing capacity Line Of Credit Facility Maximum Borrowing Capacity Line of credit facility, interest coverage ratio covenant Line Of Credit Facility Interest Coverage Ratio Covenant Line of credit facility, leverage ratio covenant Line Of Credit Facility Leverage Ratio Covenant Line of credit facility, commitment fee unused capacity Line Of Credit Facility Unused Capacity Commitment Fee Percentage Line of credit facility, remaining borrowing capacity Line Of Credit Facility Remaining Borrowing Capacity Line of credit facility, current borrowing capacity Line Of Credit Facility Current Borrowing Capacity Long-term debt, average outstanding amount. Long-term Debt, Type Longterm Debt Type [Axis] Long-term Debt, Type Longterm Debt Type [Domain] Line of Credit Line Of Credit [Member] Average Debt Outstanding Long Term Debt Average Outstanding Amount Average Interest Rate Debt Instrument Interest Rate During Period Amortizable debt issuance costs Deferred Finance Costs Gross Accumulated amortization Accumulated Amortization Deferred Finance Costs Net debt issuance costs Deferred Finance Costs Net Number of letters of credit outstanding. Number of letters of credit, outstanding Number Of Letters Of Credit Outstanding Letters of credit outstanding, amount Letters Of Credit Outstanding Amount Disaggregation Of Revenue [Abstract] Disaggregation Of Revenue [Table] Disaggregation Of Revenue [Table] Product and Service Product Or Service [Axis] Product and Service Products And Services [Domain] Energy, environmental and infrastructure. Energy, Environmental and Infrastructure Energy Environmental And Infrastructure [Member] Health, education and social programs. Health, Education and Social Programs Health Education And Social Programs [Member] Safety and security. Safety and Security Safety And Security [Member] Consumer and financial. Consumer and Financial Consumer And Financial [Member] Segments Statement Business Segments [Axis] Segments Segment [Domain] US federal government. U.S. Federal Government U S Federal Government [Member] US state and local government. U.S. State and Local Government U S State And Local Government [Member] International government. International Government International Government [Member] US state and international government. Total Government U S State And International Government [Member] Commercial. Commercial Commercial [Member] Contract with Customer, Basis of Pricing Contract With Customer Basis Of Pricing [Axis] Contract with Customer, Basis of Pricing Contract With Customer Basis Of Pricing [Domain] Time-and-Materials Time And Materials Contract [Member] Fixed-Price Fixed Price Contract [Member] Cost based contract. Cost-Based Cost Based Contract [Member] Disaggregation Of Revenue [Line Items] Disaggregation Of Revenue [Line Items] Revenue from clients Change in contract with customer assets liability net current. Net contract assets (liabilities) Change In Contract With Customer Assets Liabilities Net Current Contract with customer assets (liabilities), net current. Change in contract with customer assets net current. Change in contract with customer liability current. Contract assets Contract liabilities Net contract assets (liabilities) Contract With Customer Assets Liabilities Net Current Change in contract assets Change In Contract With Customer Asset Net Current Change in contract liabilities Change In Contract With Customer Liability Current Change in net contract assets (liabilities) Revenue from contract with customer. Revenue from contract with customer. Revenue From Contract With Customer [Table] Revenue From Contract With Customer [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Start Date [Axis] Revenue From Contract With Customer [Line Items] Revenue From Contract With Customer [Line Items] Unfulfilled performance obligation Revenue Remaining Performance Obligation Expected period to satisfy performance obligations Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 Derivative [Table] Derivative [Table] Hedging Relationship Derivative Instruments Gain Loss By Hedging Relationship [Axis] Hedging Relationship Hedging Relationship [Domain] Cash Flow Hedging Cash Flow Hedging [Member] Hedging Designation Hedging Designation [Axis] Hedging Designation Hedging Designation [Domain] Designated as Hedging Instrument Designated As Hedging Instrument [Member] Derivative Instrument Derivative Instrument Risk [Axis] Derivative Contract Derivative Contract Type [Domain] Interest Rate Swap Interest Rate Swap [Member] Interest rate swap two point eight five one zero percent. Interest Rate Swap 2.8510% Paid Rate Interest Rate Swap Two Point Eight Five One Zero Percent [Member] Derivative [Line Items] Derivative [Line Items] Notional Amount Derivative Notional Amount Paid Fixed Interest Rate% Derivative Fixed Interest Rate Beginning Dates of Effected Cash Flows Derivative Inception Dates Ending Dates of Effected Cash Flows Derivative Maturity Dates Interest Rate Swaps Total Gain or (Loss) Recognized in AOCI Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax Amount of (Gain) or Loss Reclassified from AOCI into Income Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax Estimate of time to transfer of realized losses from AOCI into earnings Derivative Instruments Gain Loss Reclassification From Accumulated O C I To Income Estimate Of Time To Transfer1 Net amount of realized losses from AOCI into earnings Derivative Instruments Gain Loss Reclassification From Accumulated O C I To Income Estimated Net Amount To Be Transferred Domestic Income Loss From Continuing Operations Before Income Taxes Domestic Foreign Income Loss From Continuing Operations Before Income Taxes Foreign Income before income taxes Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments Current: Current Income Tax Expense Benefit Continuing Operations [Abstract] Federal Current Federal Tax Expense Benefit State Current State And Local Tax Expense Benefit Foreign Current Foreign Tax Expense Benefit Total current Current Income Tax Expense Benefit Deferred: Deferred Income Tax Expense Benefit Continuing Operations [Abstract] Federal Deferred Federal Income Tax Expense Benefit State Deferred State And Local Income Tax Expense Benefit Foreign Deferred Foreign Income Tax Expense Benefit Total deferred Deferred Income Tax Expense Benefit Income tax expense Deferred tax assets foreign deferred income. Deferred tax assets accrued liabilities and other noncurrent. Represents deferred tax liabilities retention current. Represents deferred tax liabilities, payroll taxes. Represents deferred tax liabilities, unbilled revenue. Represents other current deferred tax liabilities. Income taxes. Income taxes. Income Taxes [Table] Income Taxes [Table] Income Tax Authority Income Tax Authority [Axis] Income Tax Authority Income Tax Authority [Domain] State and Local Jurisdiction State And Local Jurisdiction [Member] Income Taxes [Line Items] Income Taxes [Line Items] Deferred Tax Assets Deferred Tax Assets Gross [Abstract] Allowance for bad debt Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts Accrued paid time off Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Compensated Absences Foreign net operating loss (NOL) carry forward Deferred Tax Assets Operating Loss Carryforwards Foreign State net operating loss (NOL) carry forward Deferred Tax Assets Operating Loss Carryforwards State And Local Stock option compensation Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost Deferred rent Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Deferred Rent Deferred compensation Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation Foreign tax credits Deferred Tax Assets Tax Credit Carryforwards Foreign Tax credits Deferred Tax Assets Tax Credit Carryforwards Foreign exchange Deferred Tax Assets Unrealized Currency Losses Foreign deferred Deferred Tax Assets Foreign Deferred Income Accrued liabilities and other Deferred Tax Assets Accrued Liabilities And Other Noncurrent Deferred Tax Assets, gross, before valuation allowance Deferred Tax Assets Gross Noncurrent Less: Valuation Allowance Deferred Tax Assets Valuation Allowance Total Deferred Tax Assets Deferred Tax Assets Gross Deferred Tax Liabilities Deferred Tax Liabilities [Abstract] Retention Deferred Tax Liabilities Retention Current Prepaid expenses Deferred Tax Liabilities Prepaid Expenses Payroll taxes Deferred Tax Liabilities Payroll Taxes Unbilled revenue Deferred Tax Liabilities Unbilled Revenue Depreciation Deferred Tax Liabilities Property Plant And Equipment Amortization Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets Deferred gain and other Deferred Tax Liabilities Other Current Total Deferred Tax Liabilities Deferred Income Tax Liabilities Total Net Deferred Tax Liability Deferred Tax Liabilities Foreign Tax Authority Foreign Country [Member] Domestic Tax Authority Domestic Country [Member] Tax Period Tax Period [Axis] Tax Period Tax Period [Domain] Earliest Tax Year Earliest Tax Year [Member] Latest Tax Year Latest Tax Year [Member] Income Tax Authority, Name Income Tax Authority Name [Axis] Income Tax Authority, Name Income Tax Authority Name [Domain] Internal Revenue Service (IRS) Internal Revenue Service I R S [Member] Represents state and foreign tax jurisdictions. State and Foreign Jurisdictions State And Foreign Jurisdictions [Member] Federal corporate income tax rate Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate Tax cuts and jobs act of 2017 complete accounting change in tax rate deferred tax assets and liabilities expected to reverse in future. Tax Cuts and Jobs Act of 2017 complete accounting change in tax rate deferred tax provisional income tax expense (benefit) including adjustments to valuation allowances. Deferred tax assets and liabilities income tax rate expected to reverse in future Tax Cuts And Jobs Act Of2017 Complete Accounting Change In Tax Rate Deferred Tax Assets And Liabilities Expected To Reverse In Future Increase in deferred tax provision for income taxes, including adjustments to valuation allowances Tax Cuts And Jobs Act Of2017 Complete Accounting Change In Tax Rate Deferred Tax Provisional Income Tax Expense Benefit Including Adjustments To Valuation Allowances Tax Cuts and Jobs Act of 2017 complete accounting change in valuation allowances for cumulative foriegn tax credit carry forward. Tax Cuts and Jobs Act of 2017 complete accounting change in cumulative foreign tax credit carry forward. Income taxes provided for additional outside basis difference inherent in entities as result of reinvestment. Increase in valuation allowance Tax Cuts And Jobs Act Of2017 Complete Accounting Change In Valuation Allowances For Cumulative Foriegn Tax Credit Carry Forward Increase in cumulative foreign tax credit carryforward Tax Cuts And Jobs Act Of2017 Complete Accounting Change In Cumulative Foreign Tax Credit Carry Forward Income taxes provided for additional outside basis difference inherent in entities as result of reinvestment Income Taxes Provided For Additional Outside Basis Difference Inherent In Entities As Result Of Reinvestment Operating loss carryforwards Operating Loss Carryforwards Operating loss carryforwards expiration year. Expiration term of each operating loss carryforward. Net operating loss carryforwards, expiration year Operating Loss Carryforwards Expiration Year Operating loss carryforwards expiration term Operating Loss Carryforwards Expiration Term Tax credit carryforward, expiration date. Tax credit carryforward, amount Tax Credit Carryforward Amount Deferred tax assets, tax credit carryforwards Tax credit carryforwards, expiration year Tax Credit Carryforward Expiration Year Deferred tax assets, valuation allowance Valuation allowance, deferred tax asset, increase (decrease), amount Valuation Allowance Deferred Tax Asset Change In Amount Unrecognized tax benefits Unrecognized Tax Benefits Unrecognized tax benefits that would impact effective tax rate Unrecognized Tax Benefits That Would Impact Effective Tax Rate Unrecognized tax benefits, beginning balance Increase attributable to tax positions taken during the current period Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions Decrease attributable to settlements with taxing authorities Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities Decrease attributable to lapse of statute of limitations Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations Decrease attributable to tax positions taken during a prior period Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions Unrecognized tax benefits, ending balance Unrecognized tax benefits, income tax penalties and interest accrued Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued Open tax year Open Tax Year Taxes at statutory rate State taxes, net of federal benefit Effective Income Tax Rate Reconciliation State And Local Income Taxes Foreign tax rate differential Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential Tax legislation Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate Other permanent differences Effective Income Tax Rate Reconciliation Nondeductible Expense Other Prior year tax adjustments Effective Income Tax Rate Reconciliation Prior Year Income Taxes Unrecognized tax benefits Effective Income Tax Rate Reconciliation Tax Contingencies Valuation allowance Effective Income Tax Rate Reconciliation Change In Deferred Tax Assets Valuation Allowance Equity-based compensation Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost Tax credits Effective Income Tax Rate Reconciliation Tax Credits Taxes at effective rate Effective Income Tax Rate Continuing Operations Stockholders equity adjusted balance. Accumulated Other Comprehensive Income Loss [Table] Accumulated Other Comprehensive Income Loss [Table] Foreign Currency Translation Adjustments Accumulated Translation Adjustment [Member] Gain on Sale of Interest Rate Hedge Agreement Accumulated Gain Loss Net Cash Flow Hedge Parent [Member] Accumulated other comprehensive income loss cumulative changes in fair value on derivative designated from cash flow Hedges effect net of tax. Changes in Fair Value of Interest Rate Hedge Agreements Accumulated Other Comprehensive Income Loss Cumulative Changes In Fair Value On Derivative Designated From Cash Flow Hedges Effect Net Of Tax [Member] Accumulated Other Comprehensive Income Loss [Line Items] Accumulated Other Comprehensive Income Loss [Line Items] Reclassification of stranded tax effects due to adoption of accounting principle Cumulative Effect Of New Accounting Principle In Period Of Adoption Adjusted beginning balance Stockholders Equity Adjusted Balance Current period other comprehensive income (loss): Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent [Abstract] Other comprehensive income before reclassifications Oci Before Reclassifications Net Of Tax Attributable To Parent Amounts reclassified from accumulated other comprehensive income Reclassification From Aoci Current Period Net Of Tax Attributable To Parent Effect of taxes Other Comprehensive Income Loss Tax Portion Attributable To Parent1 Total current period other comprehensive income (loss) Effective tax rate Restricted cash - current Restricted Cash Current Total cash, cash equivalents, and restricted cash shown in the consolidated statement of cash flows Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Plan Name Plan Name [Axis] Plan Name Plan Name [Domain] Represents the Omnibus Plan. Omnibus Plan Omnibus Plan [Member] Employee Stock Option Employee Stock Option [Member] Represents share-based awards exclusive to non-employee directors. Non-Employee Director Awards Nonemployee Direct Or Awards [Member] Performance Shares Performance Shares [Member] Share-based compensation arrangement by share-based payment award, number of shares grants Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross Share-based compensation arrangement by share-based payment award, number of additional awards Share Based Compensation Arrangement By Share Based Payment Award Number Of Additional Shares Authorized Share-based compensation arrangement by share-based payment award, number of shares available for grant Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant Stock-Based Compensation Recognized Allocated Share Based Compensation Expense Stock-Based Compensation Unrecognized Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Stock-Based Compensation Unrecognized Weighted- Average Period to Recognize (Year) Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 Represents share based compensation arrangement by share based payment award fair value assumptions expected forfeiture rate. Share-based compensation arrangement by share-based payment award, options, outstanding, weighted average remaining contractual term Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 Share-based compensation arrangement by share-based payment award, fair value assumptions, expected forfeiture rate Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Forfeiture Rate Share-based compensation arrangement by share-based payment award, award vesting period Number of Shares, Outstanding Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number Number of Shares, Exercised Number of Shares, Granted Number of Shares, Forfeited/Expired Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Number of Shares, Outstanding Ending Balance Number of Shares, Vested plus expected to vest at December 31, 2019 Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number Number of Shares, Exercisable at December 31, 2019 Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number Weighted Average Exercise Price, Outstanding Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price Weighted Average Exercise Price, Exercised Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price Weighted Average Exercise Price, Granted Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price Weighted Average Exercise Price, Forfeited/Expired Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price Weighted Average Exercise Price, Outstanding Ending Balance Weighted Average Exercise Price, Vested plus expected to vest at December 31, 2019 Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Exercise Price Weighted Average Exercise Price, Exercisable at December 31, 2019 Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price Aggregate Intrinsic Value, Outstanding at December 31,2019 Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value Aggregate Intrinsic Value, Vested plus expected to vest at December 31, 2019 Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Aggregate Intrinsic Value Aggregate Intrinsic Value, Exercisable at December 31, 2019 Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 Share price Share Price Share-based compensation arrangement by share-based payment award, options, exercises in period, intrinsic value Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value Share-based compensation arrangement by share-based payment award, options, vested in period, fair value Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested In Period Fair Value1 Share-based compensation arrangement by share-based payment award, options, vested and expected to vest, exercisable, weighted average remaining contractual term Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Exercisable Weighted Average Remaining Contractual Term1 Share-based compensation arrangement by share-based payment award, options, exercisable, weighted average remaining contractual term Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 Schedule Of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range [Table] Schedule Of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range [Table] Exercise Price Range Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range [Axis] Exercise Price Range Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Domain] Represents exercise price range 1. Price Range 1 Price Range1 [Member] Represents exercise price range 2. Price Range 2 Price Range2 [Member] Represents exercise price range 3. Price Range 3 Price Range3 [Member] Price range 4. Price Range 4 Price Range4 [Member] Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] Range of Exercise Prices, Lower range Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Lower Range Limit Range of Exercise Prices, Upper range Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Upper Range Limit Number Outstanding Weighted Average Remaining Contractual Term Weighted Average Exercise Price Number Exercisable Weighted Average Exercise Price Share-based compensation arrangement by share-based payment award, equity instruments other than options, vested in period, fair value Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Fair Value The number of non-vested equity-based payment instruments (excluding stock (or unit) options) that are expected to vest. Number of Shares, Non-vested Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number Number of Shares, Granted Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Number of Shares, Vested Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Number of Shares, Cancelled Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period Number of Shares, Non-vested Ending Balance Number of Shares, expected to vest in the future Sharebased Compensation Arrangement By Sharebased Payment Award Equity Instruments Other Than Options Expected To Vest Number The weighted average grant date fair value of awards on equity-based plans (excluding options) that are expected to vest. Weighted-Average Grant Date Fair Value, Non-vested Beginning Balance Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value Weighted-Average Grant Date Fair Value, Granted Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value Weighted-Average Grant Date Fair Value, Vested Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value Weighted-Average Grant Date Fair Value, Cancelled Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value Weighted-Average Grant Date Fair Value, Non-vested Ending Balance Weighted-Average Grant Date Fair Value, expected to vest in the future Sharebased Compensation Arrangement By Sharebased Payment Award Equity Instruments Other Than Options Expected To Vest Weighted Average Grant Date Fair Value Amount by which the current fair value of the underlying stock exceeds the exercise price of expected to vest equity instruments (other than options) outstanding. Aggregate Intrinsic Value, Non-vested Sharebased Compensation Arrangement By Sharebased Payment Award Equity Instruments Other Than Options Aggregate Intrinsic Value Nonvested Aggregate Intrinsic Value, expected to vest in the future Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Aggregate Intrinsic Value Weighted- Average Grant Date Fair Value Number of performance period in performance based share program. Percentage of multiplication award by product. Share based compensation arrangement by share based payment award, equity instruments other than options, grants in period, as adjusted. Share based compensation arrangement by share based payment award, equity instruments other than options, expected to vest. Number of performance period in performance based share program Number Of Performance Period In Performance Based Share Program Percentage of multiplication award by product Percentage Of Multiplication Award By Product Number of shares, granted Number of shares, vested Number of shares, granted, adjusted for partial performance periods Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period As Adjusted Number of shares, expected to vest Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Expected To Vest Number of Shares Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Roll Forward Weighted-Average Grant Date Fair Value Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value Roll Forward Aggregate Intrinsic Value Sharebased Compensation Arrangement By Sharebased Payment Award Equity Instruments Other Than Options Aggregate Intrinsic Value [Abstract] Dividend Yield Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate Historical Volatility Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Risk-Free Rate of Returns Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Antidilutive securities excluded from computation of earnings per share, amount Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Basic weighted-average shares outstanding Effect of potential exercise of stock options, RSUs, and PSAs Incremental Common Shares Attributable To Share Based Payment Arrangements Diluted weighted-average shares outstanding Line of credit facility, condition for unlimited share repurchases, leverage ratio. Stock repurchase program, authorized amount Stock Repurchase Program Authorized Amount1 Line of credit facility, condition permitted for unlimited share repurchases, leverage ratio Line Of Credit Facility Condition For Unlimited Share Repurchases Leverage Ratio Stock Repurchased During Period, Shares Stock Repurchased During Period Shares Stock Repurchased During Period, Value Stock Repurchased During Period Value Stock repurchase program, remaining authorized repurchase amount Stock Repurchase Program Remaining Authorized Repurchase Amount1 Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Measurement Frequency Fair Value By Measurement Frequency [Axis] Measurement Frequency Fair Value Measurement Frequency [Domain] Fair Value, Recurring Fair Value Measurements Recurring [Member] Fair Value Hierarchy and NAV Fair Value By Fair Value Hierarchy Level [Axis] Fair Value Hierarchy and NAV Fair Value Measurements Fair Value Hierarchy [Domain] Level 1 Fair Value Inputs Level1 [Member] Level 2 Fair Value Inputs Level2 [Member] Level 3 Fair Value Inputs Level3 [Member] Financial Instrument Financial Instrument [Axis] Financial Instruments Transfers And Servicing Of Financial Instruments Types Of Financial Instruments [Domain] Forward Contract Agreements Forward Contracts [Member] Deferred compensation investments in cash surrender life insurance. Deferred Compensation Investments in Cash Surrender Life Insurance Deferred Compensation Investments In Cash Surrender Life Insurance [Member] Deferred compensation plan liabilities. Deferred Compensation Plan Liabilities Deferred Compensation Plan Liabilities [Member] Prepaid Expenses and Other Prepaid Expenses And Other Current Assets [Member] Other Assets Other Noncurrent Assets [Member] Long-term Liabilities, Other Other Noncurrent Liabilities [Member] Contingent liability related to acquisition. Contingent Liability Related to Acquisition Contingent Liability Related To Acquisition [Member] Accrued expenses and other current liabilities. Accrued Expenses and Other Current Liabilities Accrued Expenses And Other Current Liabilities [Member] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Assets: Assets Fair Value Disclosure [Abstract] Assets, Total Assets Fair Value Disclosure Liabilities: Liabilities Fair Value Disclosure [Abstract] Liabilities, Total Financial Liabilities Fair Value Disclosure The period of the contract. The amount of the contract award. Loss Contingencies [Table] Loss Contingencies [Table] Collaborative Arrangement and Arrangement Other than Collaborative Type Of Arrangement [Axis] Collaborative Arrangement and Arrangement Other than Collaborative Arrangements And Nonarrangement Transactions [Member] Represents the Road Home contract. Road Home Contract Road Home Contract [Member] Litigation Case Litigation Case [Axis] Litigation Case Litigation Case Type [Domain] Represents the legal matters between OCD and ICF Emergency. OCD vs ICF Emergency O C D Vs I C F Emergency [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Contract term, period Contract Term Period Contract award, value Contract Award Value Community development related to the claim. Loss contingency damages sought value Loss Contingency Damages Sought Value Community development related to claim Community Development Related To Claim Represents maximum defer of compensation subject to statutory limitations percentage. Represents percentage of employer matching contributions condition, one. Represents the percentage of employee entitled to employer matching contribution condition, one. Represents the percentage of employer matching contributions condition, two. Represents the percentage of employee entitled to employer matching contribution condition, two. Maximum defer of compensation subject to statutory limitations, percentage Maximum Defer Of Compensation Subject To Statutory Limitations Percentage Percentage of employer matching contributions condition, one Percentage Of Employer Matching Contributions Condition One Percentage of employee entitled to employer matching contribution condition, one Percentage Of Employee Entitled To Employer Matching Contribution Condition One Percentage of employer matching contributions condition, two Percentage Of Employer Matching Contributions Condition Two Percentage of employee entitled to employer matching contribution condition, two Percentage Of Employee Entitled To Employer Matching Contribution Condition Two Defined contribution plan, employer discretionary contribution amount Defined Contribution Plan Employer Discretionary Contribution Amount Represents the deferred compensation on performance bonuses eligible percentage. Deferred compensation arrangement with individual, cash awards granted, percentage Deferred Compensation Arrangement With Individual Cash Awards Granted Percentage Deferred compensation on performance bonuses that eligible employee, percentage Deferred Compensation On Performance Bonuses That Eligible Employee Percentage Defined contribution plan, employers matching contribution, annual vesting percentage Defined Contribution Plan Employers Matching Contribution Annual Vesting Percentage Represents employee stock purchase plan shares authorized. Represents employee stock purchase plan annual maximum payroll deduction. The per share value of stock issued during the period as a result of employee stock purchase plan. Represents employee stock purchase plan number of shares available for grant. Employee stock purchase plan shares authorized Employee Stock Purchase Plan Shares Authorized Employee stock purchase plan annual maximum payroll deduction Employee Stock Purchase Plan Annual Maximum Payroll Deduction Share-based compensation arrangement by share-based payment award, discount from market price, purchase date Share Based Compensation Arrangement By Share Based Payment Award Discount From Market Price Purchase Date Stock issued during period, shares, employee stock purchase plans Stock Issued During Period Shares Employee Stock Purchase Plans Stock issued during period, value, employee stock purchase plans, per share Stock Issued During Period Value Employee Stock Purchase Plans Per Share Employee stock purchase plan, number of shares available for grant Employee Stock Purchase Plan Number Of Shares Available For Grant Subsequent Event [Table] Subsequent Event [Table] Subsequent Event Type Subsequent Event Type [Axis] Subsequent Event Type Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] ITG. ITG I T G [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Acquire of membership interests Business Acquisition Percentage Of Voting Interests Acquired Purchase price Business Combination Consideration Transferred1 Purchase price of escrow account for indemnification claims. Hold back purchase price for post-closing and working capital adjustments Escrow Deposit Purchase price of escrow account for indemnification claims Purchase Price Of Escrow Account For Indemnification Claims Aggregate notional amount Derivative, fixed interest rate Beginning dates of effected cash flows Ending dates of effected cash flows Dividend declaration date Dividends Payable Date Declared Day Month And Year Cash dividend per share Dividends Payable Amount Per Share Dividend payment date Dividend Payable Date To Be Paid Day Month And Year Dividend record date Dividends Payable Date Of Record Day Month And Year Amount of increase (decrease) from foreign currency translation adjustments of a valuation allowance for receivables due a company that are expected to be uncollectible. Allowance For Doubtful Accounts Receivable Rollforward Balance at beginning of period Allowance For Doubtful Accounts Receivable Write-offs, net of recoveries Allowance For Doubtful Accounts Receivable Write Offs Effect of foreign currency translation Allowance For Doubtful Accounts Foreign Currency Translation Balance at end of period Valuation Allowance [Abstract] Balance at beginning of period Provision for income taxes - valuation allowance Balance at end of period Operating income Earnings per share: Weighted-average common shares outstanding Weighted Average Number Of Shares Outstanding [Abstract]