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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 29, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income including noncontrolling interests	$ 137,128	$ 239,436	$ 111,537
Other comprehensive income (loss), net of tax
Foreign currency translation adjustment, net of tax	8,418	(7,800)	4,793
Pension adjustments, net of tax	281	(56)	(95)
Comprehensive income including noncontrolling interests, net of tax	145,827	231,580	116,235
Comprehensive income attributable to noncontrolling interests, net of tax	(16,597)	(17,197)	(14,210)
Comprehensive income attributable to Parsons Corporation, net of tax	$ 129,230	$ 214,383	$ 102,025

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