Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Revenue	$ 1,008,721	$ 879,356	$ 1,957,790	$ 1,754,053
Direct cost of contracts	781,772	680,328	1,515,672	1,349,410
Equity in earnings of unconsolidated joint ventures	5,613	9,428	11,211	16,958
Selling, general and administrative expenses	199,932	188,238	385,009	375,760
Operating income	32,630	20,218	68,320	45,841
Interest income	171	152	236	250
Interest expense	(4,525)	(4,910)	(8,463)	(9,451)
Other income (expense), net	236	405	381	(1,386)
Total other income (expense)	(4,118)	(4,353)	(7,846)	(10,587)
Income before income tax expense	28,512	15,865	60,474	35,254
Income tax expense	(5,732)	(3,838)	(13,851)	(9,213)
Net income including noncontrolling interests	22,780	12,027	46,623	26,041
Net income attributable to noncontrolling interests	(4,485)	(5,325)	(7,661)	(10,300)
Net income attributable to Parsons Corporation	$ 18,295	$ 6,702	$ 38,962	$ 15,741
Earnings per share:
Basic	$ 0.18	$ 0.07	$ 0.38	$ 0.15
Diluted	$ 0.17	$ 0.06	$ 0.35	$ 0.15