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Revenue Recognition - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | $ 423,110 | $ 392,525 | $ 836,578 | $ 771,003
Time-and-Materials |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 169,980 | 162,249 | 334,821 | 322,085
Fixed-Price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 185,823 | 160,288 | 369,962 | 307,757
Cost-Based |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 67,307 | 69,988 | 131,795 | 141,161
U.S. Federal Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 225,229 | 182,241 | 444,221 | 358,225
U.S. State and Local Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 64,056 | 58,487 | 130,165 | 115,637
International Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 27,144 | 37,148 | 53,863 | 73,894
Total Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | 316,429 | 277,876 | 628,249 | 547,756
Commercial |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | $ 106,681 | $ 114,649 | $ 208,329 | $ 223,247
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% | 41.00% | 40.00% | 42.00%
Customer Concentration Risk | Revenue from Contract with Customer | Fixed-Price |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 44.00% | 41.00% | 44.00% | 40.00%
Customer Concentration Risk | Revenue from Contract with Customer | Cost-Based |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 16.00% | 18.00% | 16.00% | 18.00%
Customer Concentration Risk | Revenue from Contract with Customer | U.S. Federal Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 53.00% | 46.00% | 53.00% | 46.00%
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% | 15.00% | 16.00% | 15.00%
Customer Concentration Risk | Revenue from Contract with Customer | International Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 7.00% | 10.00% | 6.00% | 10.00%
Customer Concentration Risk | Revenue from Contract with Customer | Total Government |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 75.00% | 71.00% | 75.00% | 71.00%
Customer Concentration Risk | Revenue from Contract with Customer | Commercial |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 25.00% | 29.00% | 25.00% | 29.00%
Energy, Environmental and Infrastructure |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | $ 160,401 | $ 167,309 | $ 316,444 | $ 330,533
Energy, Environmental and Infrastructure | Customer Concentration Risk | Revenue from Contract with Customer |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 38.00% | 43.00% | 38.00% | 43.00%
Health, Education and Social Programs |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | $ 208,953 | $ 167,640 | $ 414,750 | $ 325,906
Health, Education and Social Programs | Customer Concentration Risk | Revenue from Contract with Customer |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 49.00% | 43.00% | 50.00% | 42.00%
Safety and Security |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | $ 33,409 | $ 29,618 | $ 62,809 | $ 60,816
Safety and Security | Customer Concentration Risk | Revenue from Contract with Customer |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 8.00% | 7.00% | 7.00% | 8.00%
Consumer and Financial |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients | $ 20,347 | $ 27,958 | $ 42,575 | $ 53,748
Consumer and Financial | Customer Concentration Risk | Revenue from Contract with Customer |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from clients, Percent | 5.00% | 7.00% | 5.00% | 7.00%

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