Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 970,993	$ 904,405
Direct cost of contracts	769,632	714,237
Equity in earnings of unconsolidated joint ventures	6,114	10,397
Indirect, general and administrative expenses	183,774	177,519
Operating income	23,701	23,046
Interest income	228	477
Interest expense	(4,022)	(8,292)
Other income (expense), net	(452)	41
Total other income (expense)	(4,246)	(7,774)
Income before income tax expense	19,455	15,272
Income tax expense	(5,084)	(1,886)
Net income including noncontrolling interests	14,371	13,386
Net income attributable to noncontrolling interests	(1,398)	(3,645)
Net income attributable to Parsons Corporation	$ 12,973	$ 9,741
Earnings per share:
Basic	$ 0.13	$ 0.12
Diluted	$ 0.13	$ 0.12