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Investments in and Advances to Joint Ventures - Summary of Financial Information for Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Current assets | $ 1,843,130 |  |  |  | $ 1,526,409 |  |  |  | $ 1,843,130 | $ 1,526,409 |
Total assets | 3,937,704 |  |  |  | 3,450,368 |  |  |  | 3,937,704 | 3,450,368 |
Current liabilities | 1,187,409 |  |  |  | 1,144,382 |  |  |  | 1,187,409 | 1,144,382 |
Total liabilities | 2,076,287 |  |  |  | 1,789,612 |  |  |  | 2,076,287 | 1,789,612 |
Total joint venture equity | 1,813,772 |  |  |  | 1,629,890 |  |  |  | 1,813,772 | 1,629,890 |
Investments in and advances to unconsolidated joint ventures | 68,975 |  |  |  | 68,620 |  |  |  | 68,975 | 68,620 |
Revenue | 964,258 | $ 1,004,236 | $ 979,459 | $ 970,993 | 1,037,388 | $ 1,023,277 | $ 989,742 | $ 904,405 | 3,918,946 | 3,954,812 | $ 3,560,508
Costs |  |  |  |  |  |  |  |  | 3,042,087 | 3,123,062 | 2,795,005
Net income attributable to Parsons Corporation | 21,611 | $ 40,658 | $ 23,299 | $ 12,973 | 13,722 | $ 56,812 | $ 40,259 | $ 9,741 | 98,541 | 120,534 | 222,337
Equity in earnings of unconsolidated joint ventures |  |  |  |  |  |  |  |  | 30,059 | 41,721 | 36,915
Unconsolidated Joint Ventures |  |  |  |  |  |  |  |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |
Current assets | 774,646 |  |  |  | 801,335 |  |  |  | 774,646 | 801,335 |
Noncurrent assets | 585,802 |  |  |  | 564,160 |  |  |  | 585,802 | 564,160 |
Total assets | 1,360,448 |  |  |  | 1,365,495 |  |  |  | 1,360,448 | 1,365,495 |
Current liabilities | 703,287 |  |  |  | 655,495 |  |  |  | 703,287 | 655,495 |
Noncurrent liabilities | 517,697 |  |  |  | 507,131 |  |  |  | 517,697 | 507,131 |
Total liabilities | 1,220,984 |  |  |  | 1,162,626 |  |  |  | 1,220,984 | 1,162,626 |
Total joint venture equity | 139,464 |  |  |  | 202,869 |  |  |  | 139,464 | 202,869 |
Investments in and advances to unconsolidated joint ventures | $ 68,975 |  |  |  | $ 68,620 |  |  |  | 68,975 | 68,620 |
Revenue |  |  |  |  |  |  |  |  | 1,830,802 | 2,081,341 | 1,773,037
Costs |  |  |  |  |  |  |  |  | 1,709,933 | 1,903,582 | 1,661,232
Net income attributable to Parsons Corporation |  |  |  |  |  |  |  |  | 120,869 | 177,759 | 111,805
Equity in earnings of unconsolidated joint ventures |  |  |  |  |  |  |  |  | $ 30,059 | $ 41,721 | $ 36,915

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