Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net (loss) income including noncontrolling interests	$ (92,112)	$ 35,276
Other comprehensive income, net of tax
Foreign currency translation adjustment, net of tax	(1,927)	(177)
Pension adjustments, net of tax	(31)	1
Comprehensive (loss) income including noncontrolling interests, net of tax	(94,070)	35,100
Comprehensive income attributable to noncontrolling interests, net of tax	(15,243)	(9,723)
Comprehensive (loss) income attributable to Parsons Corporation, net of tax	$ (109,313)	$ 25,377