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Revenue Recognition - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | $ 467,777 | $ 394,060 | $ 1,304,355 | $ 1,165,063
Time-and-Materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 188,758 | 157,627 | 523,635 | 479,712
Fixed-Price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 210,810 | 166,053 | 580,738 | 473,810
Cost-Based |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 68,209 | 70,380 | 199,982 | 211,541
U.S. Federal Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 271,255 | 195,153 | 714,993 | 553,378
U.S. State and Local Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 65,613 | 58,792 | 195,791 | 174,446
International Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 23,075 | 32,697 | 78,978 | 107,850
Total Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 359,943 | 286,642 | 989,762 | 835,674
Commercial |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | $ 107,834 | $ 107,418 | $ 314,593 | $ 329,389
Customer Concentration Risk | Revenue from Contract with Customer |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 100.00% | 100.00% | 100.00% | 100.00%
Customer Concentration Risk | Revenue from Contract with Customer | Time-and-Materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 40.00% | 40.00% | 40.00% | 41.00%
Customer Concentration Risk | Revenue from Contract with Customer | Fixed-Price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 45.00% | 42.00% | 45.00% | 41.00%
Customer Concentration Risk | Revenue from Contract with Customer | Cost-Based |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 15.00% | 18.00% | 15.00% | 18.00%
Customer Concentration Risk | Revenue from Contract with Customer | U.S. Federal Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 58.00% | 50.00% | 55.00% | 48.00%
Customer Concentration Risk | Revenue from Contract with Customer | U.S. State and Local Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 14.00% | 15.00% | 15.00% | 15.00%
Customer Concentration Risk | Revenue from Contract with Customer | International Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 5.00% | 8.00% | 6.00% | 9.00%
Customer Concentration Risk | Revenue from Contract with Customer | Total Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 77.00% | 73.00% | 76.00% | 72.00%
Customer Concentration Risk | Revenue from Contract with Customer | Commercial |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 23.00% | 27.00% | 24.00% | 28.00%
Energy, Environmental and Infrastructure |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | $ 166,956 | $ 156,384 | $ 483,415 | $ 486,945
Energy, Environmental and Infrastructure | Customer Concentration Risk | Revenue from Contract with Customer |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 36.00% | 40.00% | 37.00% | 42.00%
Health, Education and Social Programs |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | $ 249,034 | $ 182,292 | $ 663,739 | $ 508,161
Health, Education and Social Programs | Customer Concentration Risk | Revenue from Contract with Customer |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 53.00% | 46.00% | 51.00% | 43.00%
Safety and Security |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | $ 33,760 | $ 28,311 | $ 96,568 | $ 89,130
Safety and Security | Customer Concentration Risk | Revenue from Contract with Customer |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 7.00% | 7.00% | 7.00% | 8.00%
Consumer and Financial |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | $ 18,027 | $ 27,073 | $ 60,633 | $ 80,827
Consumer and Financial | Customer Concentration Risk | Revenue from Contract with Customer |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 4.00% | 7.00% | 5.00% | 7.00%

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