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Revenue Recognition - Disaggregation of Revenue (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients | $ 483,282 | $ 413,468
Time-and-Materials |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients | 200,990 | 164,968
Fixed-Price |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients | 219,016 | 184,012
Cost-Based |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients | 63,276 | 64,488
U.S. Federal Government |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients | 267,742 | 219,044
U.S. State and Local Government |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients | 74,933 | 66,117
International Government |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients | 20,669 | 27,377
Total Government |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients | 363,344 | 312,538
Commercial |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients | $ 119,938 | $ 100,930
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% | 40.00%
Customer Concentration Risk | Revenue from Contract with Customer | Fixed-Price |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients, Percent | 45.00% | 44.00%
Customer Concentration Risk | Revenue from Contract with Customer | Cost-Based |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients, Percent | 13.00% | 16.00%
Customer Concentration Risk | Revenue from Contract with Customer | U.S. Federal Government |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients, Percent | 55.00% | 53.00%
Customer Concentration Risk | Revenue from Contract with Customer | U.S. State and Local Government |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients, Percent | 16.00% | 16.00%
Customer Concentration Risk | Revenue from Contract with Customer | International Government |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients, Percent | 4.00% | 7.00%
Customer Concentration Risk | Revenue from Contract with Customer | Total Government |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients, Percent | 75.00% | 76.00%
Customer Concentration Risk | Revenue from Contract with Customer | Commercial |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients, Percent | 25.00% | 24.00%
Energy, Environment, Infrastructure, and Disaster Recovery |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients | $ 187,396 | $ 169,028
Energy, Environment, Infrastructure, and Disaster Recovery | Customer Concentration Risk | Revenue from Contract with Customer |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients, Percent | 39.00% | 41.00%
Health and Social Programs |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients | $ 203,698 | $ 156,057
Health and Social Programs | Customer Concentration Risk | Revenue from Contract with Customer |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients, Percent | 42.00% | 38.00%
Security and Other Civilian & Commercial |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients | $ 92,188 | $ 88,383
Security and Other Civilian & Commercial | Customer Concentration Risk | Revenue from Contract with Customer |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from clients, Percent | 19.00% | 21.00%

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