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Revenue Recognition - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients | $ 378,478 | $ 358,238
Time-and-Materials |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients | 160,009 | 168,070
Fixed-Price |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients | 147,296 | 133,204
Cost-Based |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients | 71,173 | 56,964
U.S. Federal Government |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients | 175,913 | 155,604
U.S. State and Local Government |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients | 57,152 | 60,893
International Government |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients | 37,061 | 22,801
Total Government |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients | 270,126 | 239,298
Commercial |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients | $ 108,352 | $ 118,940
Customer Concentration Risk | Revenue from Contract with Customer |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients, Percent | 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% | 47.00%
Customer Concentration Risk | Revenue from Contract with Customer | Fixed-Price |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients, Percent | 39.00% | 37.00%
Customer Concentration Risk | Revenue from Contract with Customer | Cost-Based |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients, Percent | 19.00% | 16.00%
Customer Concentration Risk | Revenue from Contract with Customer | U.S. Federal Government |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients, Percent | 46.00% | 43.00%
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% | 17.00%
Customer Concentration Risk | Revenue from Contract with Customer | International Government |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients, Percent | 10.00% | 7.00%
Customer Concentration Risk | Revenue from Contract with Customer | Total Government |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients, Percent | 71.00% | 67.00%
Customer Concentration Risk | Revenue from Contract with Customer | Commercial |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients, Percent | 29.00% | 33.00%
Energy, Environmental and Infrastructure |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients | $ 164,492 | $ 148,961
Energy, Environmental and Infrastructure | Customer Concentration Risk | Revenue from Contract with Customer |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients, Percent | 43.00% | 42.00%
Health, Education and Social Programs |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients | $ 157,765 | $ 151,352
Health, Education and Social Programs | Customer Concentration Risk | Revenue from Contract with Customer |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients, Percent | 42.00% | 42.00%
Safety and Security |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients | $ 31,198 | $ 30,301
Safety and Security | Customer Concentration Risk | Revenue from Contract with Customer |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients, Percent | 8.00% | 8.00%
Consumer and Financial Services |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients | $ 25,023 | $ 27,624
Consumer and Financial Services | Customer Concentration Risk | Revenue from Contract with Customer |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients, Percent | 7.00% | 8.00%

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