Consolidated Statements of Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Revenue	$ 1,670,467	$ 1,356,486	$ 3,206,143	$ 2,529,952
Direct cost of contracts	1,318,931	1,068,220	2,529,758	1,985,408
Equity in (losses) earnings of unconsolidated joint ventures	(16,837)	75	(18,897)	(5,765)
Selling, general and administrative expenses	223,277	211,897	444,222	411,205
Operating income	111,422	76,444	213,266	127,574
Interest income	3,825	306	4,977	1,099
Interest expense	(13,008)	(7,299)	(26,006)	(13,757)
Loss on extinguishment of debt	0	0	(211,018)	0
Other income (expense), net	895	543	(2,431)	1,857
Total other income (expense)	(8,288)	(6,450)	(234,478)	(10,801)
Income (loss) before income tax expense	103,134	69,994	(21,212)	116,773
Income tax (expense) benefit	(22,415)	(15,223)	9,819	(26,726)
Net income (loss) including noncontrolling interests	80,719	54,771	(11,393)	90,047
Net income attributable to noncontrolling interests	(11,547)	(11,530)	(26,790)	(21,253)
Net income (loss) attributable to Parsons Corporation	$ 69,172	$ 43,241	$ (38,183)	$ 68,794
Earnings (loss) per share:
Basic	$ 0.65	$ 0.41	$ (0.36)	$ 0.66
Diluted	$ 0.63	$ 0.38	$ (0.36)	$ 0.61