v3.26.1
Segment Information - Summary of Adjusted EBITDA Business Segment Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting Information [Line Items]    
Revenue $ 1,491,176 $ 1,554,360
Direct cost of contracts (1,133,756) (1,200,377)
Selling, general and administrative expenses (93,800) (91,536)
Equity in earnings (losses) of unconsolidated joint ventures 6,156 (687)
Other segment items (131,322) (128,041)
Adjusted EBITDA attributable to Parsons Corporation 138,454 133,719
Reconciliation: Segment Adjusted EBITDA to Net Income Attributable to Parsons Corporation    
Adjusted EBITDA attributable to noncontrolling interests 12,475 15,057
Depreciation and amortization (35,926) (27,403)
Interest expense, net (14,187) (10,104)
Income tax expense (16,087) (18,977)
Equity-based compensation expense (9,454) (7,103)
Transaction-related costs (8,439) (3,701)
Other (1,625) 299
Net income including noncontrolling interests 65,211 81,787
Net income attributable to noncontrolling interests (12,285) (15,584)
Net income attributable to Parsons Corporation 52,926 66,203
Federal Solution Segment    
Segment Reporting Information [Line Items]    
Revenue 758,348 842,557
Direct cost of contracts (585,415) (661,912)
Selling, general and administrative expenses (46,342) (45,409)
Equity in earnings (losses) of unconsolidated joint ventures 1,792 (992)
Other segment items (56,830) (58,712)
Adjusted EBITDA attributable to Parsons Corporation 71,553 75,532
Critical Infrastructure    
Segment Reporting Information [Line Items]    
Revenue 732,828 711,803
Direct cost of contracts (548,341) (538,465)
Selling, general and administrative expenses (47,458) (46,127)
Equity in earnings (losses) of unconsolidated joint ventures 4,364 305
Other segment items (74,492) (69,329)
Adjusted EBITDA attributable to Parsons Corporation $ 66,901 $ 58,187