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Segment Information - Summary of Adjusted EBITDA Business Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 01, 2024	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Revenue		$ 1,554,360	$ 1,535,676
Direct cost of contracts		(1,200,377)	(1,210,827)
Selling, general and administrative expenses		(91,536)	(69,725)
Equity in earnings (losses) of unconsolidated joint ventures		(687)	(2,060)
Other segment items		(128,041)	(127,560)
Adjusted EBITDA attributable to Parsons Corporation		133,719	125,504
Reconciliation: Segment Adjusted EBITDA to Net Income Attributable to Parsons Corporation
Adjusted EBITDA attributable to noncontrolling interests		15,057	15,589
Depreciation and amortization		(27,403)	(24,531)
Interest expense, net		(10,104)	(11,846)
Income tax expense		(18,977)	(13,324)
Equity-based compensation expense		(7,103)	(12,656)
Convertible debt repurchase loss	$ (18,400)	0	(18,355)
Transaction-related costs		(3,701)	(2,886)
Other		299	(2,502)
Net income including noncontrolling interests		81,787	54,993
Net income attributable to noncontrolling interests		(15,584)	(15,243)
Net income attributable to Parsons Corporation		66,203	39,750
Federal Solution Segment
Segment Reporting Information [Line Items]
Revenue		842,557	909,608
Direct cost of contracts		(661,912)	(723,885)
Selling, general and administrative expenses		(45,409)	(35,145)
Equity in earnings (losses) of unconsolidated joint ventures		(992)	(469)
Other segment items		(58,712)	(57,568)
Adjusted EBITDA attributable to Parsons Corporation		75,532	92,541
Critical Infrastructure
Segment Reporting Information [Line Items]
Revenue		711,803	626,068
Direct cost of contracts		(538,465)	(486,942)
Selling, general and administrative expenses		(46,127)	(34,580)
Equity in earnings (losses) of unconsolidated joint ventures		305	(1,591)
Other segment items		(69,329)	(69,992)
Adjusted EBITDA attributable to Parsons Corporation		$ 58,187	$ 32,963

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