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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Schedule Of Equity Method Investments [Line Items]          
Current assets $ 2,649,045   $ 2,649,045   $ 2,462,400
Total assets 5,736,717   5,736,717   5,487,962
Current liabilities 1,587,951   1,587,951   1,915,644
Total liabilities 3,072,077   3,072,077   2,953,473
Total joint venture equity 2,557,830   2,557,830   2,416,389
Revenue 1,621,748 $ 1,810,116 4,760,431 $ 5,016,259  
Costs 1,261,893 1,449,831 3,698,240 3,979,589  
Net income attributable to Parsons Corporation 64,123 71,951 185,556 180,873  
Net income attributable to noncontrolling interests 17,671 13,638 48,514 40,428  
Consolidated Joint Ventures          
Schedule Of Equity Method Investments [Line Items]          
Current assets 515,072   515,072   519,450
Noncurrent assets 8,184   8,184   9,841
Total assets 523,256   523,256   529,291
Current liabilities 309,665   309,665   296,774
Noncurrent liabilities 3,022   3,022   2,203
Total liabilities 312,687   312,687   298,977
Total joint venture equity 210,569   210,569   $ 230,314
Revenue 213,752 193,461 602,905 582,209  
Costs 178,123 165,873 505,145 500,308  
Net income attributable to Parsons Corporation 35,629 27,588 97,760 81,901  
Net income attributable to noncontrolling interests $ 17,671 $ 13,638 $ (48,514) $ 40,428