Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income (loss) including noncontrolling interests	$ 80,719	$ 54,771	$ (11,393)	$ 90,047
Other comprehensive income, net of tax
Foreign currency translation adjustment, net of tax	(2,245)	3,152	(4,172)	2,975
Pension adjustments, net of tax	(16)	16	(47)	17
Comprehensive income (loss) including noncontrolling interests, net of tax	78,458	57,939	(15,612)	93,039
Comprehensive income attributable to noncontrolling interests, net of tax	(11,559)	(11,533)	(26,802)	(21,256)
Comprehensive income (loss) attributable to Parsons Corporation, net of tax	$ 66,899	$ 46,406	$ (42,414)	$ 71,783