Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Accumulated Other Comprehensive (Loss) Income	Total Parsons Equity	Noncontrolling Interests
Beginning balance at Dec. 31, 2021	$ 1,937,112	$ 146,277	$ (867,391)	$ 2,684,979	$ (53,529)	$ (9,568)	$ 1,900,768	$ 36,344
Comprehensive income
Net income	126,565				96,664		96,664	29,901
Foreign currency translation gain (loss), net	(7,752)					(7,734)	(7,734)	(18)
Pension adjustments, net	(547)					(547)	(547)
Contributions of treasury stock to ESOP	53,801		22,455	31,346			53,801
Contributions	10,266							10,266
Distributions	(24,128)							(24,128)
Issuance of equity securities, net of retirements	(390)	429		(773)	(46)		(390)
Repurchases of common stock	(22,000)	(574)		(21,426)			(22,000)
Stock-based compensation	23,008			23,008			23,008
Ending Balance at Dec. 31, 2022	2,095,935	146,132	(844,936)	2,717,134	43,089	(17,849)	2,043,570	52,365
Comprehensive income
Net income	207,915				161,149		161,149	46,766
Foreign currency translation gain (loss), net	2,375					2,373	2,373	2
Pension adjustments, net	568					568	568
Contributions of treasury stock to ESOP	57,429		17,625	39,804			57,429
Contributions	2,867							2,867
Distributions	(12,496)							(12,496)
Issuance of equity securities, net of retirements	(1,243)	442		(1,171)	(514)		(1,243)
Repurchases of common stock	(11,000)	(233)		(10,767)			(11,000)
Stock-based compensation	34,365			34,365			34,365
Ending Balance at Dec. 31, 2023	2,376,715	146,341	(827,311)	2,779,365	203,724	(14,908)	2,287,211	89,504
Comprehensive income
Net income	290,665				235,053		235,053	55,612
Foreign currency translation gain (loss), net	(11,546)					(11,555)	(11,555)	9
Pension adjustments, net	(131)					(131)	(131)
Contributions of treasury stock to ESOP	58,228		12,029	46,199			58,228
Contributions	2,174							2,174
Distributions	(29,199)							(29,199)
Capped call transactions	(66,121)			(66,121)			(66,121)
Repurchase of warrants	(104,952)			(104,952)			(104,952)
Bond hedge termination	149,308			149,308			149,308
Issuance of equity securities, net of retirements	(14,630)	601		(3,235)	(11,996)		(14,630)
Convertible debt inducement	(147,105)			(147,105)			(147,105)
Repurchases of common stock	(24,999)	(287)		(24,712)			(24,999)
Stock-based compensation	56,082			56,082			56,082
Ending Balance at Dec. 31, 2024	$ 2,534,489	$ 146,655	$ (815,282)	$ 2,684,829	$ 426,781	$ (26,594)	$ 2,416,389	$ 118,100