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Segment Information - Summary of Adjusted EBITDA Business Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Adjusted EBITDA attributable to Parsons Corporation        
Adjusted EBITDA attributable to Parsons Corporation $ 76,852 $ 94,730 $ 200,808 $ 236,923
Adjusted EBITDA attributable to noncontrolling interests 7,540 6,071 18,010 15,535
Depreciation and amortization (37,232) (30,952) (106,540) (95,442)
Interest expense, net (3,987) (5,387) (13,188) (13,144)
Income tax expense (9,165) (16,017) (18,378) (32,992)
Equity-based compensation expense (3,224) 991 (15,125) (4,142)
Transaction-related costs (2,537) (2,411) (9,269) (11,937)
Restructuring expense (357) (365) (507) (1,475)
Other (1,121) (140) (3,001) (1,310)
Net income including noncontrolling interests 26,769 46,520 52,810 92,016
Net income attributable to noncontrolling interests 7,411 5,862 17,711 15,086
Net income attributable to Parsons Corporation 19,358 40,658 35,099 76,930
Federal Solution Segment        
Adjusted EBITDA attributable to Parsons Corporation        
Adjusted EBITDA attributable to Parsons Corporation 46,481 45,874 110,963 125,191
Critical Infrastructure        
Adjusted EBITDA attributable to Parsons Corporation        
Adjusted EBITDA attributable to Parsons Corporation $ 30,371 $ 48,856 $ 89,845 $ 111,732