Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement Of Income And Comprehensive Income [Abstract]
Net income including noncontrolling interests	$ 22,780	$ 12,027	$ 46,623	$ 26,041
Other comprehensive income, net of tax
Foreign currency translation adjustment, net of tax	(5,383)	3,012	(2,509)	7,926
Pension adjustments, net of tax	(47)	19	(25)	38
Comprehensive income including noncontrolling interests, net of tax	17,350	15,058	44,089	34,005
Comprehensive income attributable to noncontrolling interests, net of tax	(4,482)	(5,324)	(7,659)	(10,304)
Comprehensive income attributable to Parsons Corporation, net of tax	$ 12,868	$ 9,734	$ 36,430	$ 23,701