Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Revenue	$ 949,069	$ 874,697
Direct cost of contracts	733,900	669,082
Equity in earnings of unconsolidated joint ventures	5,598	7,530
Selling, general and administrative expenses	185,077	187,522
Operating income	35,690	25,623
Interest income	65	98
Interest expense	(3,938)	(4,541)
Other income (expense), net	145	(1,791)
Total other income (expense)	(3,728)	(6,234)
Income before income tax expense	31,962	19,389
Income tax expense	(8,119)	(5,375)
Net income including noncontrolling interests	23,843	14,014
Net income attributable to noncontrolling interests	(3,176)	(4,975)
Net income attributable to Parsons Corporation	$ 20,667	$ 9,039
Earnings per share:
Basic	$ 0.20	$ 0.09
Diluted	$ 0.19	$ 0.09