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v3.20.4

Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue From Contract With Customer [Abstract] |
Disaggregation of Revenue | Disaggregation of Revenue
| Year ended December 31, |
| 2020 |  |  | 2019 |  |  | 2018 |
Client Markets: |  |  |  |  |  |  |  |  |  |  |
Energy, environment, and infrastructure | $ | 616,296 |  |  | $ | 663,799 |  |  | $ | 564,736 |
Health, education, and social programs |  | 670,618 |  |  |  | 567,351 |  |  |  | 535,578 |
Safety and security |  | 117,979 |  |  |  | 118,279 |  |  |  | 111,660 |
Consumer and financial |  | 101,982 |  |  |  | 129,096 |  |  |  | 125,999 |
Total | $ | 1,506,875 |  |  | $ | 1,478,525 |  |  | $ | 1,337,973 |
| Year ended December 31, |
| 2020 |  |  | 2019 |  |  | 2018 |
Client Type: |  |  |  |  |  |  |  |  |  |  |
U.S. federal government | $ | 666,961 |  |  | $ | 560,953 |  |  | $ | 546,050 |
U.S. state and local government |  | 222,730 |  |  |  | 279,833 |  |  |  | 183,900 |
International government |  | 95,734 |  |  |  | 122,125 |  |  |  | 122,186 |
Total Government |  | 985,425 |  |  |  | 962,911 |  |  |  | 852,136 |
Commercial |  | 521,450 |  |  |  | 515,614 |  |  |  | 485,837 |
Total | $ | 1,506,875 |  |  | $ | 1,478,525 |  |  | $ | 1,337,973 |
| Year ended December 31, |
| 2020 |  |  | 2019 |  |  | 2018 |
Contract Mix: |  |  |  |  |  |  |  |  |  |  |
Time-and-materials | $ | 749,844 |  |  | $ | 700,980 |  |  | $ | 581,446 |
Fixed-price |  | 529,157 |  |  |  | 566,299 |  |  |  | 526,751 |
Cost-based |  | 227,874 |  |  |  | 211,246 |  |  |  | 229,776 |
Total | $ | 1,506,875 |  |  | $ | 1,478,525 |  |  | $ | 1,337,973 |
Schedule of Contract Balances and Changes in Contract Balances | Contract Balances:
| December 31, 2020 |  |  | December 31, 2019 |  |  | Change |
Contract assets | $ | 143,369 |  |  | $ | 142,337 |  |  | $ | 1,032 |
Contract liabilities |  | (42,050 | ) |  |  | (37,413 | ) |  |  | (4,637 | )
Net contract assets | $ | 101,319 |  |  | $ | 104,924 |  |  | $ | (3,605 | )

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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=121604090&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=121604090&loc=SL49130545-203045 + Details
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