v3.26.1
Investments in and Advances to Joint Ventures - Summary of Financial Information for Consolidated Joint Ventures (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Schedule Of Equity Method Investments [Line Items]          
Current assets $ 2,720,278   $ 2,720,278   $ 2,683,543
Total assets 6,106,946   6,106,946   5,769,534
Current liabilities 1,637,140   1,637,140   1,531,664
Total liabilities 3,359,177   3,359,177   3,001,862
Total joint venture equity 2,631,419   2,631,419   2,642,020
Revenue 1,575,867 $ 1,584,323 3,067,043 $ 3,138,683  
Costs 1,280,629 1,235,970 2,414,385 2,436,347  
Net (loss) income attributable to Parsons Corporation (15,219) 55,230 37,707 121,433  
Net income attributable to noncontrolling interests 14,754 15,259 27,039 30,843  
Consolidated Joint Ventures          
Schedule Of Equity Method Investments [Line Items]          
Current assets 501,733   501,733   542,877
Noncurrent assets 6,771   6,771   7,961
Total assets 508,504   508,504   550,838
Current liabilities 280,225   280,225   301,891
Noncurrent liabilities 3,033   3,033   3,417
Total liabilities 283,258   283,258   305,308
Total joint venture equity 225,246   225,246   $ 245,530
Revenue 201,958 192,795 378,947 389,153  
Costs 172,295 162,068 324,597 327,022  
Net (loss) income attributable to Parsons Corporation 29,663 30,727 54,350 62,131  
Net income attributable to noncontrolling interests $ 14,754 $ 15,259 $ 27,039 $ 30,843