Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total Parsons Equity	Noncontrolling Interest
Beginning 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	90,047				68,794		68,794	21,253
Foreign currency translation gain (loss), net	2,975					2,972	2,972	3
Pension adjustments, net	17					17	17
Contributions	200							200
Distributions	(2,487)							(2,487)
Issuance of equity securities, net of retirements	(3,900)	365		(3,895)	(370)		(3,900)
Repurchases of common stock	(8,000)	(185)		(7,815)			(8,000)
Stock-based compensation	15,978			15,978			15,978
Ending Balance at Jun. 30, 2023	2,190,766	146,312	(844,936)	2,721,402	111,513	(14,860)	2,119,431	71,335
Beginning balance at Mar. 31, 2023	2,125,530	146,244	(844,936)	2,712,167	68,429	(18,025)	2,063,879	61,651
Comprehensive income
Net income	54,771				43,241		43,241	11,530
Foreign currency translation gain (loss), net	3,152					3,149	3,149	3
Pension adjustments, net	16					16	16
Distributions	(1,849)							(1,849)
Issuance of equity securities, net of retirements	2,160	114		2,203	(157)		2,160
Repurchases of common stock	(2,000)	(46)		(1,954)			(2,000)
Stock-based compensation	8,986			8,986			8,986
Ending Balance at Jun. 30, 2023	2,190,766	146,312	(844,936)	2,721,402	111,513	(14,860)	2,119,431	71,335
Beginning 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	(11,393)				(38,183)		(38,183)	26,790
Foreign currency translation gain (loss), net	(4,172)					(4,184)	(4,184)	12
Pension adjustments, net	(47)					(47)	(47)
Contributions	77							77
Distributions	(15,249)							(15,249)
Capped call transactions	(66,121)			(66,121)			(66,121)
Adjustments to warrant repurchased	(104,952)			(104,952)			(104,952)
Bond hedge termination	149,308			149,308			149,308
Issuance of equity securities, net of retirements	(15,197)	487		(5,678)	(10,006)		(15,197)
Repurchases of common stock	(10,000)	(131)		(9,869)			(10,000)
Stock-based compensation	20,675			20,675			20,675
Ending Balance at Jun. 30, 2024	2,319,644	146,697	(827,311)	2,762,728	155,535	(19,139)	2,218,510	101,134
Beginning balance at Mar. 31, 2024	2,243,157	146,717	(827,311)	2,759,867	87,261	(16,866)	2,149,668	93,489
Comprehensive income
Net income	80,719				69,172		69,172	11,547
Foreign currency translation gain (loss), net	(2,245)					(2,257)	(2,257)	12
Pension adjustments, net	(16)					(16)	(16)
Contributions	77							77
Distributions	(3,991)							(3,991)
Issuance of equity securities, net of retirements	1,791	111		2,578	(898)		1,791
Repurchases of common stock	(10,000)	(131)		(9,869)			(10,000)
Stock-based compensation	10,152			10,152			10,152
Ending Balance at Jun. 30, 2024	$ 2,319,644	$ 146,697	$ (827,311)	$ 2,762,728	$ 155,535	$ (19,139)	$ 2,218,510	$ 101,134