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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
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Schedule Of Equity Method Investments [Line Items]      
Current assets $ 2,401,171   $ 2,462,400
Total assets 5,449,144   5,487,962
Current liabilities 1,865,470   1,915,644
Total liabilities 2,903,412   2,953,473
Total joint venture equity 2,453,794   2,416,389
Investments in and advances to unconsolidated joint ventures 142,248   138,759
Revenue 1,554,360 $ 1,535,676  
Costs 1,200,377 1,210,827  
Net income attributable to Parsons Corporation 66,203 39,750  
Equity in earnings of unconsolidated joint ventures (687) (2,060)  
Unconsolidated Joint Ventures      
Schedule Of Equity Method Investments [Line Items]      
Current assets 1,445,838   1,477,950
Noncurrent assets 429,081   431,476
Total assets 1,874,919   1,909,426
Current liabilities 950,485   947,072
Noncurrent liabilities 457,622   469,808
Total liabilities 1,408,107   1,416,880
Total joint venture equity 466,812   492,546
Investments in and advances to unconsolidated joint ventures 142,248   $ 138,759
Revenue 524,556 473,532  
Costs 520,876 476,750  
Net income attributable to Parsons Corporation 3,680 (3,218)  
Unconsolidated Joint Ventures      
Schedule Of Equity Method Investments [Line Items]      
Equity in earnings of unconsolidated joint ventures $ (687) $ (2,060)