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Revenue Recognition - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | $ 394,060 | $ 360,315 | $ 1,165,063 | $ 1,072,540
Time-and-Materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 157,571 | 168,250 | 479,632 | 504,772
Fixed-Price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 166,121 | 135,260 | 473,901 | 392,525
Cost-Based |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 70,368 | 56,805 | 211,530 | 175,243
U.S. Federal Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 195,107 | 175,126 | 553,232 | 501,525
U.S. State and Local Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 58,516 | 50,819 | 173,451 | 169,001
International Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 32,249 | 20,194 | 107,175 | 60,861
Total Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 285,872 | 246,139 | 833,858 | 731,387
Commercial |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | $ 108,188 | $ 114,176 | $ 331,205 | $ 341,153
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% | 47.00% | 41.00% | 47.00%
Customer Concentration Risk | Revenue from Contract with Customer | Fixed-Price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 42.00% | 37.00% | 41.00% | 37.00%
Customer Concentration Risk | Revenue from Contract with Customer | Cost-Based |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 18.00% | 16.00% | 18.00% | 16.00%
Customer Concentration Risk | Revenue from Contract with Customer | U.S. Federal Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 49.00% | 49.00% | 48.00% | 47.00%
Customer Concentration Risk | Revenue from Contract with Customer | U.S. State and Local Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 15.00% | 14.00% | 15.00% | 16.00%
Customer Concentration Risk | Revenue from Contract with Customer | International Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 8.00% | 5.00% | 9.00% | 5.00%
Customer Concentration Risk | Revenue from Contract with Customer | Total Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 72.00% | 68.00% | 72.00% | 68.00%
Customer Concentration Risk | Revenue from Contract with Customer | Commercial |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 28.00% | 32.00% | 28.00% | 32.00%
Energy, Environmental and Infrastructure |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | $ 156,661 | $ 147,188 | $ 488,018 | $ 445,592
Energy, Environmental and Infrastructure | Customer Concentration Risk | Revenue from Contract with Customer |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 40.00% | 41.00% | 42.00% | 42.00%
Health, Education and Social Programs |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | $ 182,334 | $ 158,297 | $ 508,255 | $ 461,808
Health, Education and Social Programs | Customer Concentration Risk | Revenue from Contract with Customer |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 46.00% | 44.00% | 44.00% | 43.00%
Safety and Security |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | $ 28,304 | $ 30,539 | $ 89,120 | $ 90,944
Safety and Security | Customer Concentration Risk | Revenue from Contract with Customer |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 7.00% | 8.00% | 7.00% | 8.00%
Consumer and Financial Services |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | $ 26,761 | $ 24,291 | $ 79,670 | $ 74,196
Consumer and Financial Services | Customer Concentration Risk | Revenue from Contract with Customer |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 7.00% | 7.00% | 7.00% | 7.00%

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