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 | |||
|---|---|---|---|---|---|
Dec. 31, 2024 |
Mar. 31, 2024 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
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| Schedule Of Equity Method Investments [Line Items] | |||||
| Current assets | $ 2,462,400 | $ 2,462,400 | $ 2,137,526 | ||
| Total assets | 5,487,962 | 5,487,962 | 4,804,061 | ||
| Current liabilities | 1,915,644 | 1,915,644 | 1,410,884 | ||
| Total liabilities | 2,953,473 | 2,953,473 | 2,427,346 | ||
| Total joint venture equity | 2,416,389 | 2,416,389 | 2,287,211 | ||
| Investments in and advances to unconsolidated joint ventures | 138,759 | 138,759 | 128,204 | ||
| Revenue | 1,734,317 | $ 1,535,676 | 6,750,576 | 5,442,749 | $ 4,195,272 |
| Costs | 5,344,154 | 4,236,735 | 3,248,550 | ||
| Net income attributable to Parsons Corporation | 54,180 | $ 39,750 | 235,053 | 161,149 | 96,664 |
| Equity in (losses) earnings of unconsolidated joint ventures | (23,361) | (47,751) | 16,347 | ||
| Unconsolidated Joint Ventures | |||||
| Schedule Of Equity Method Investments [Line Items] | |||||
| Current assets | 1,477,950 | 1,477,950 | 1,607,953 | ||
| Noncurrent assets | 431,476 | 431,476 | 483,693 | ||
| Total assets | 1,909,426 | 1,909,426 | 2,091,646 | ||
| Current liabilities | 947,072 | 947,072 | 1,057,113 | ||
| Noncurrent liabilities | 469,808 | 469,808 | 518,647 | ||
| Total liabilities | 1,416,880 | 1,416,880 | 1,575,760 | ||
| Total joint venture equity | 492,546 | 492,546 | 515,886 | ||
| Investments in and advances to unconsolidated joint ventures | $ 138,759 | 138,759 | 128,204 | ||
| Revenue | 2,118,799 | 2,313,420 | 2,406,407 | ||
| Costs | 2,108,768 | 2,310,114 | 2,325,472 | ||
| Net income attributable to Parsons Corporation | 10,031 | 3,306 | 80,935 | ||
| Unconsolidated Joint Ventures | |||||
| Schedule Of Equity Method Investments [Line Items] | |||||
| Equity in (losses) earnings of unconsolidated joint ventures | $ (23,361) | $ (47,751) | $ 16,347 | ||
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