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Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2021
Revenue From Contract With Customer [Abstract] |
Disaggregation of Revenue | Disaggregation of Revenue
| Year ended December 31, |
| 2021 |  |  | 2020 |  |  | 2019 |
Client Markets: |  |  |  |  |  |  |  |  |  |  |
Energy, environment, and infrastructure | $ | 654,488 |  |  | $ | 609,358 |  |  | $ | 663,799 |
Health, education, and social programs |  | 678,047 |  |  |  | 677,454 |  |  |  | 567,351 |
Safety and security |  | 115,266 |  |  |  | 120,599 |  |  |  | 118,279 |
Consumer and financial |  | 105,247 |  |  |  | 99,464 |  |  |  | 129,096 |
Total | $ | 1,553,048 |  |  | $ | 1,506,875 |  |  | $ | 1,478,525 |
| Year ended December 31, |
| 2021 |  |  | 2020 |  |  | 2019 |
Client Type: |  |  |  |  |  |  |  |  |  |  |
U.S. federal government | $ | 735,031 |  |  | $ | 666,968 |  |  | $ | 560,953 |
U.S. state and local government |  | 233,757 |  |  |  | 219,507 |  |  |  | 279,833 |
International government |  | 136,245 |  |  |  | 93,581 |  |  |  | 122,125 |
Total Government |  | 1,105,033 |  |  |  | 980,056 |  |  |  | 962,911 |
Commercial |  | 448,015 |  |  |  | 526,819 |  |  |  | 515,614 |
Total | $ | 1,553,048 |  |  | $ | 1,506,875 |  |  | $ | 1,478,525 |
| Year ended December 31, |
| 2021 |  |  | 2020 |  |  | 2019 |
Contract Mix: |  |  |  |  |  |  |  |  |  |  |
Time-and-materials | $ | 633,574 |  |  | $ | 732,365 |  |  | $ | 700,980 |
Fixed-price |  | 645,351 |  |  |  | 536,903 |  |  |  | 566,299 |
Cost-based |  | 274,123 |  |  |  | 237,607 |  |  |  | 211,246 |
Total | $ | 1,553,048 |  |  | $ | 1,506,875 |  |  | $ | 1,478,525 |
Schedule of Contract Balances and Changes in Contract Balances | Contract Balances:
| December 31, 2021 |  |  | December 31, 2020 |  |  | Change |
Contract assets | $ | 137,867 |  |  | $ | 143,369 |  |  | $ | (5,502 | )
Contract liabilities |  | (39,665 | ) |  |  | (42,050 | ) |  |  | 2,385 |
Net contract assets | $ | 98,202 |  |  | $ | 101,319 |  |  | $ | (3,117 | )

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 + Details
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- References No definition available. + Details
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