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Revenue Recognition (Tables) | 6 Months Ended
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Jun. 30, 2021
Revenue From Contract With Customer [Abstract] |
Disaggregation of Revenue | Disaggregation of Revenue Changes in the three and six months ended June 30, 2021 compared to the three and six months ended June 30, 2020 were driven by an increase of revenue in the energy, environment, and infrastructure client market, primarily led by revenue from international government clients, an increase in the health, education, and social programs client market led by revenue from U.S. federal government and international government clients, and an increase in the consumer and financial services client market led by revenue from commercial clients. Revenue from safety and security client market saw a slight decrease in the three months ended June 30, 2021 compared to 2020, mainly from U.S. federal government clients, and a slight increase in the six months ended June 30, 2021 compared to 2020, mainly from international government clients.
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
|  | Dollars |  |  | Percent |  |  | Dollars |  |  | Percent |  |  | Dollars |  |  | Percent |  |  | Dollars |  |  | Percent |
Client Markets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Energy, environment, and infrastructure |  | $ | 168,230 |  |  |  | 43 | % |  | $ | 150,234 |  |  |  | 42 | % |  | $ | 332,510 |  |  |  | 43 | % |  | $ | 299,050 |  |  |  | 42 | %
Health, education, and social programs |  |  | 167,319 |  |  |  | 43 | % |  |  | 152,036 |  |  |  | 43 | % |  |  | 325,255 |  |  |  | 42 | % |  |  | 303,388 |  |  |  | 43 | %
Safety and security |  |  | 29,618 |  |  |  | 7 | % |  |  | 30,086 |  |  |  | 9 | % |  |  | 60,816 |  |  |  | 8 | % |  |  | 60,403 |  |  |  | 8 | %
Consumer and financial services |  |  | 27,358 |  |  |  | 7 | % |  |  | 21,631 |  |  |  | 6 | % |  |  | 52,422 |  |  |  | 7 | % |  |  | 49,384 |  |  |  | 7 | %
Total |  | $ | 392,525 |  |  |  | 100 | % |  | $ | 353,987 |  |  |  | 100 | % |  | $ | 771,003 |  |  |  | 100 | % |  | $ | 712,225 |  |  |  | 100 | %
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
|  | Dollars |  |  | Percent |  |  | Dollars |  |  | Percent |  |  | Dollars |  |  | Percent |  |  | Dollars |  |  | Percent |
Client Type: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. federal government |  | $ | 182,188 |  |  |  | 46 | % |  | $ | 170,786 |  |  |  | 48 | % |  | $ | 358,100 |  |  |  | 46 | % |  | $ | 326,389 |  |  |  | 46 | %
U.S. state and local government |  |  | 58,058 |  |  |  | 15 | % |  |  | 57,388 |  |  |  | 16 | % |  |  | 114,961 |  |  |  | 15 | % |  |  | 118,280 |  |  |  | 16 | %
International government |  |  | 37,801 |  |  |  | 10 | % |  |  | 17,858 |  |  |  | 5 | % |  |  | 74,925 |  |  |  | 10 | % |  |  | 40,667 |  |  |  | 6 | %
Total Government |  |  | 278,047 |  |  |  | 71 | % |  |  | 246,032 |  |  |  | 69 | % |  |  | 547,986 |  |  |  | 71 | % |  |  | 485,336 |  |  |  | 68 | %
Commercial |  |  | 114,478 |  |  |  | 29 | % |  |  | 107,955 |  |  |  | 31 | % |  |  | 223,017 |  |  |  | 29 | % |  |  | 226,889 |  |  |  | 32 | %
Total |  | $ | 392,525 |  |  |  | 100 | % |  | $ | 353,987 |  |  |  | 100 | % |  | $ | 771,003 |  |  |  | 100 | % |  | $ | 712,225 |  |  |  | 100 | %
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
|  | Dollars |  |  | Percent |  |  | Dollars |  |  | Percent |  |  | Dollars |  |  | Percent |  |  | Dollars |  |  | Percent |
Contract Mix: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Time-and-materials |  | $ | 162,368 |  |  |  | 41 | % |  | $ | 168,371 |  |  |  | 48 | % |  | $ | 322,146 |  |  |  | 42 | % |  | $ | 336,521 |  |  |  | 47 | %
Fixed price |  |  | 160,169 |  |  |  | 41 | % |  |  | 124,141 |  |  |  | 35 | % |  |  | 307,696 |  |  |  | 40 | % |  |  | 257,265 |  |  |  | 36 | %
Cost-based |  |  | 69,988 |  |  |  | 18 | % |  |  | 61,475 |  |  |  | 17 | % |  |  | 141,161 |  |  |  | 18 | % |  |  | 118,439 |  |  |  | 17 | %
Total |  | $ | 392,525 |  |  |  | 100 | % |  | $ | 353,987 |  |  |  | 100 | % |  | $ | 771,003 |  |  |  | 100 | % |  | $ | 712,225 |  |  |  | 100 | %
Schedule of Contract Balances and Changes in Contract Balances | Contract Balances: Contract assets consist primarily of unbilled amounts resulting from long-term contracts when revenue recognized exceeds the amount billed often due to billing schedule timing. Contract liabilities result from advance payments received on a contract or from billings in excess of revenue recognized on long-term contracts due to billing schedule timing. The following table summarizes the contract balances as of June 30, 2021 and December 31, 2020:
|  | June 30, 2021 |  |  | December 31, 2020 |  |  | $ Change |  |  | % Change |
Contract assets |  | $ | 150,390 |  |  | $ | 143,369 |  |  | $ | 7,021 |  |  |  | 4.9 | %
Contract liabilities |  |  | (35,700 | ) |  |  | (42,050 | ) |  |  | 6,350 |  |  |  | (15.1 | %)
Net contract assets (liabilities) |  | $ | 114,690 |  |  | $ | 101,319 |  |  | $ | 13,371 |  |  |  | 13.2 | %

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