Consolidated Statements of Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Revenue	$ 1,535,676	$ 1,173,466
Direct cost of contracts	1,210,827	917,188
Equity in losses of unconsolidated joint ventures	(2,060)	(5,840)
Selling, general and administrative expenses	220,945	199,308
Operating income	101,844	51,130
Interest income	1,152	793
Interest expense	(12,998)	(6,458)
Loss on extinguishment of debt	(211,018)	0
Other income (expense), net	(3,326)	1,314
Total other income (expense)	(226,190)	(4,351)
(Loss) income before income tax expense	(124,346)	46,779
Income tax benefit (expense)	32,234	(11,503)
Net (loss) income including noncontrolling interests	(92,112)	35,276
Net income attributable to noncontrolling interests	(15,243)	(9,723)
Net (loss) income attributable to Parsons Corporation	$ (107,355)	$ 25,553
(Loss) earnings per share:
Basic	$ (1.01)	$ 0.24
Diluted	$ (1.01)	$ 0.23