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Segment Information - Summary of Adjusted EBITDA Business Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 01, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]          
Revenue   $ 1,621,748 $ 1,810,116 $ 4,760,431 $ 5,016,259
Direct cost of contracts   (1,261,893) (1,449,831) (3,698,240) (3,979,589)
Selling, general and administrative expenses   (92,239) (77,592) (275,542) (217,059)
Equity in earnings (losses) of unconsolidated joint ventures   8,266 872 6,937 (18,025)
Other segment items   (135,578) (130,467) (386,298) (384,593)
Adjusted EBITDA attributable to Parsons Corporation   140,304 153,098 407,288 416,995
Reconciliation: Segment Adjusted EBITDA to Net Income Attributable to Parsons Corporation          
Adjusted EBITDA attributable to noncontrolling interests   17,833 13,913 48,756 41,339
Depreciation and amortization   (29,849) (24,542) (85,844) (73,513)
Interest expense, net   (11,696) (8,802) (33,301) (29,831)
Income tax expense   (16,035) (22,518) (53,702) (58,257)
Equity-based compensation expense   (11,568) (21,251) (30,190) (44,554)
Convertible debt repurchase loss $ (18,400)     0 (18,355)
Transaction-related costs   (5,074) (3,770) (13,910) (8,958)
Restructuring expense   (292)   (2,653)  
Other   (1,829) (539) (2,374) (3,565)
Net income including noncontrolling interests   81,794 85,589 234,070 221,301
Net income attributable to noncontrolling interests   (17,671) (13,638) (48,514) (40,428)
Net income attributable to Parsons Corporation   64,123 71,951 185,556 180,873
Federal Solution Segment          
Segment Reporting Information [Line Items]          
Revenue   788,607 1,105,580 2,436,628 3,003,791
Direct cost of contracts   (612,500) (881,208) (1,917,218) (2,394,247)
Selling, general and administrative expenses   (47,980) (42,816) (136,604) (113,448)
Equity in earnings (losses) of unconsolidated joint ventures   986 1,002 983 1,999
Other segment items   (56,612) (62,467) (168,684) (182,682)
Adjusted EBITDA attributable to Parsons Corporation   72,501 120,091 215,105 315,413
Critical Infrastructure          
Segment Reporting Information [Line Items]          
Revenue   833,141 704,536 2,323,803 2,012,468
Direct cost of contracts   (649,393) (568,623) (1,781,022) (1,585,341)
Selling, general and administrative expenses   (44,259) (34,776) (138,938) (103,611)
Equity in earnings (losses) of unconsolidated joint ventures   7,280 (130) 5,954 (20,024)
Other segment items   (78,966) (68,000) (217,614) (201,910)
Adjusted EBITDA attributable to Parsons Corporation   $ 67,803 $ 33,007 $ 192,183 $ 101,582