v3.25.4
Investments in and Advances to Joint Ventures - Summary of Financial Information for Unconsolidated Joint Ventures (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Schedule Of Equity Method Investments [Line Items]      
Current assets $ 2,683,543 $ 2,462,400  
Total assets 5,769,534 5,487,962  
Current liabilities 1,531,664 1,915,644  
Total liabilities 3,001,862 2,953,473  
Total joint venture equity 2,642,020 2,416,389  
Investments in and advances to unconsolidated joint ventures 148,640 138,759  
Revenue 6,364,245 6,750,576 $ 5,442,749
Costs 4,932,711 5,344,154 4,236,735
Net income attributable to Parsons Corporation 241,139 235,053 161,149
Equity in earnings (losses) of unconsolidated joint ventures 2,583 (23,361) (47,751)
Unconsolidated Joint Ventures      
Schedule Of Equity Method Investments [Line Items]      
Current assets 1,549,367 1,477,950  
Noncurrent assets 439,496 431,476  
Total assets 1,988,863 1,909,426  
Current liabilities 1,046,970 947,072  
Noncurrent Liabilities 469,833 469,808  
Total liabilities 1,516,803 1,416,880  
Total joint venture equity 472,060 492,546  
Investments in and advances to unconsolidated joint ventures 148,640 138,759  
Revenue 2,140,784 2,118,799 2,313,420
Costs 2,042,084 2,108,768 2,310,114
Net income attributable to Parsons Corporation 98,700 10,031 3,306
Unconsolidated Joint Ventures      
Schedule Of Equity Method Investments [Line Items]      
Equity in earnings (losses) of unconsolidated joint ventures $ 2,583 $ (23,361) $ (47,751)