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Segment Information - Summary of Adjusted EBITDA Business Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Adjusted EBITDA attributable to Parsons Corporation    
Adjusted EBITDA attributable to Parsons Corporation $ 63,639 $ 58,974
Adjusted EBITDA attributable to noncontrolling interests 5,060 1,522
Depreciation and amortization (34,673) (32,409)
Interest expense, net (4,443) (3,794)
Income tax expense (5,375) (5,084)
Equity-based compensation income (expense) (6,980) 7,721
Transaction-related costs (2,646) (12,011)
Restructuring expense (77) 33
Other (491) (581)
Net income including noncontrolling interests 14,014 14,371
Net income attributable to noncontrolling interests 4,975 1,398
Net income attributable to Parsons Corporation 9,039 12,973
Federal Solution Segment    
Adjusted EBITDA attributable to Parsons Corporation    
Adjusted EBITDA attributable to Parsons Corporation 31,982 31,617
Critical Infrastructure    
Adjusted EBITDA attributable to Parsons Corporation    
Adjusted EBITDA attributable to Parsons Corporation $ 31,657 $ 27,357