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Revenue Recognition - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | $ 512,029 | $ 500,085 | $ 1,006,465 | $ 983,367
Time-and-Materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 217,587 | 208,171 | 423,680 | 409,290
Fixed-Price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 235,398 | 225,731 | 460,253 | 444,637
Cost-Based |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 59,044 | 66,183 | 122,532 | 129,440
U.S. Federal Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 273,471 | 273,060 | 547,666 | 540,802
U.S. State and Local Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 84,850 | 81,054 | 161,803 | 156,296
International Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 28,696 | 26,212 | 53,959 | 46,831
Total Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 387,017 | $ 380,326 | 763,428 | 743,929
Commercial |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | $ 125,012 |  | $ 243,037 | $ 239,438
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 | 42.00% | 42.00% | 42.00% | 42.00%
Customer Concentration Risk | Revenue from Contract with Customer | Fixed-Price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 46.00% | 45.00% | 46.00% | 45.00%
Customer Concentration Risk | Revenue from Contract with Customer | Cost-Based |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 12.00% | 13.00% | 12.00% | 13.00%
Customer Concentration Risk | Revenue from Contract with Customer | U.S. Federal Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 53.00% | 55.00% | 54.00% | 55.00%
Customer Concentration Risk | Revenue from Contract with Customer | U.S. State and Local Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 17.00% | 16.00% | 16.00% | 16.00%
Customer Concentration Risk | Revenue from Contract with Customer | International Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 6.00% | 5.00% | 6.00% | 5.00%
Customer Concentration Risk | Revenue from Contract with Customer | Total Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 76.00% | 76.00% | 76.00% | 76.00%
Customer Concentration Risk | Revenue from Contract with Customer | Commercial |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 24.00% | 24.00% | 24.00% | 24.00%
Energy, Environment, Infrastructure, and Disaster Recovery |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | $ 232,655 | $ 203,834 | $ 457,260 | $ 391,027
Energy, Environment, Infrastructure, and Disaster Recovery | Customer Concentration Risk | Revenue from Contract with Customer |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 45.00% | 41.00% | 45.00% | 40.00%
Health and Social Programs |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | $ 194,929 | $ 205,530 | $ 385,053 | $ 408,239
Health and Social Programs | Customer Concentration Risk | Revenue from Contract with Customer |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 38.00% | 41.00% | 39.00% | 41.00%
Security and Other Civilian & Commercial |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | $ 84,445 | $ 90,721 | $ 164,152 | $ 184,101
Security and Other Civilian & Commercial | Customer Concentration Risk | Revenue from Contract with Customer |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 17.00% | 18.00% | 16.00% | 19.00%

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