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
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Schedule Of Equity Method Investments [Line Items]      
Current assets $ 2,594,140   $ 2,683,543
Total assets 6,012,108   5,769,534
Current liabilities 1,479,543   1,531,664
Total liabilities 3,257,951   3,001,862
Total joint venture equity 2,649,613   2,642,020
Revenue 1,491,176 $ 1,554,360  
Costs 1,133,756 1,200,377  
Net income attributable to Parsons Corporation 52,926 66,203  
Net income attributable to noncontrolling interests 12,285 15,584  
Consolidated Joint Ventures      
Schedule Of Equity Method Investments [Line Items]      
Current assets 468,867   542,877
Noncurrent assets 7,207   7,961
Total assets 476,074   550,838
Current liabilities 263,851   301,891
Noncurrent liabilities 3,222   3,417
Total liabilities 267,073   305,308
Total joint venture equity 209,001   $ 245,530
Revenue 176,989 196,358  
Costs 152,302 164,954  
Net income attributable to Parsons Corporation 24,687 31,404  
Net income attributable to noncontrolling interests $ 12,285 $ 15,584