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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, 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
Investments in and advances to unconsolidated joint ventures 156,421   156,421   138,759
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  
Equity in earnings of unconsolidated joint ventures 8,266 872 6,937 (18,025)  
Unconsolidated Joint Ventures          
Schedule Of Equity Method Investments [Line Items]          
Current assets 1,431,451   1,431,451   1,477,950
Noncurrent assets 433,197   433,197   431,476
Total assets 1,864,648   1,864,648   1,909,426
Current liabilities 937,469   937,469   947,072
Noncurrent liabilities 477,035   477,035   469,808
Total liabilities 1,414,504   1,414,504   1,416,880
Total joint venture equity 450,144   450,144   492,546
Investments in and advances to unconsolidated joint ventures 156,421   156,421   $ 138,759
Revenue 608,305 581,232 1,558,656 1,598,764  
Costs 563,832 560,492 1,476,009 1,593,213  
Net income attributable to Parsons Corporation 44,473 20,740 82,647 5,551  
Unconsolidated Joint Ventures          
Schedule Of Equity Method Investments [Line Items]          
Equity in earnings of unconsolidated joint ventures $ 8,266 $ 872 $ 6,937 $ (18,025)