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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income including noncontrolling interests	$ 26,769	$ 46,520	$ 52,810	$ 92,016
Other comprehensive income (loss), net of tax
Foreign currency translation adjustment, net of tax	(4,205)	1,926	3,721	(3,770)
Pension adjustments, net of tax	(26)	20	12	(18)
Comprehensive income including noncontrolling interests, net of tax	22,538	48,466	56,543	88,228
Comprehensive income attributable to noncontrolling interests, net of tax	(7,407)	(5,866)	(17,711)	(15,086)
Comprehensive income attributable to Parsons Corporation, net of tax	$ 15,131	$ 42,600	$ 38,832	$ 73,142

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