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Investments in and Advances to Joint Ventures - Summary of Financial Information for Consolidated Joint Ventures (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Schedule Of Equity Method Investments [Line Items]      
Current assets $ 1,802,207   $ 1,843,130
Total assets 3,865,001   3,937,704
Current liabilities 1,110,667   1,187,409
Total liabilities 2,024,559   2,076,287
Total joint venture equity 1,796,799   1,813,772
Revenue 874,697 $ 970,993  
Costs 669,082 769,632  
Net income attributable to Parsons Corporation 9,039 12,973  
Net income attributable to noncontrolling interests 4,975 1,398  
Consolidated Joint Ventures      
Schedule Of Equity Method Investments [Line Items]      
Current assets 299,764   292,407
Noncurrent assets 2,888   2,990
Total assets 302,652   295,397
Current liabilities 214,015   201,270
Total liabilities 214,015   201,270
Total joint venture equity 88,637   $ 94,127
Revenue 96,624 100,278  
Costs 86,306 97,150  
Net income attributable to Parsons Corporation 10,318 3,128  
Net income attributable to noncontrolling interests $ 4,975 $ 1,398