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Investments in and Advances to Joint Ventures - Summary of Financial Information for Unconsolidated Joint Ventures (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Schedule Of Equity Method Investments [Line Items]          
Current assets $ 1,586,571   $ 1,586,571   $ 1,843,130
Total assets 3,823,933   3,823,933   3,937,704
Current liabilities 1,060,659   1,060,659   1,187,409
Total liabilities 1,970,057   1,970,057   2,076,287
Total joint venture equity 1,824,078   1,824,078   1,813,772
Investments in and advances to unconsolidated joint ventures 102,677   102,677   68,975
Revenue 956,050 $ 1,004,236 2,710,103 $ 2,954,688  
Costs 734,652 788,769 2,084,062 2,307,725  
Net income attributable to Parsons Corporation 19,358 40,658 35,099 76,930  
Equity in earnings of unconsolidated joint ventures 9,570 16,741 26,528 26,624  
Unconsolidated Joint Ventures          
Schedule Of Equity Method Investments [Line Items]          
Current assets 1,103,345   1,103,345   774,646
Noncurrent assets 554,366   554,366   585,802
Total assets 1,657,711   1,657,711   1,360,448
Current liabilities 789,072   789,072   703,287
Noncurrent liabilities 562,523   562,523   517,697
Total liabilities 1,351,595   1,351,595   1,220,984
Total joint venture equity 306,116   306,116   139,464
Investments in and advances to unconsolidated joint ventures 102,677   102,677   $ 68,975
Revenue 728,461 594,640 1,701,262 1,286,087  
Costs 697,493 551,624 1,604,538 1,202,315  
Net income attributable to Parsons Corporation 30,968 43,016 96,724 83,772  
Equity in earnings of unconsolidated joint ventures $ 9,570 $ 16,741 $ 26,528 $ 26,624