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Quarterly Information - Unaudited - Schedule of Selected Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Jan. 01, 2024	Mar. 31, 2025	Mar. 31, 2024
Selected Quarterly Financial Information [Line items]
Revenue		$ 1,554,360	$ 1,535,676
Operating income		109,233	101,844
Convertible debt repurchase loss	$ (18,400)	0	(18,355)
Income Tax Expense (Benefit)		18,977	13,324
Net (loss) income attributable to Parsons Corporation		$ 66,203	$ 39,750
(Loss) earnings per share:
Basic		$ 0.62	$ 0.37
Diluted		$ 0.6	$ 0.37
ASU 2024-04
Selected Quarterly Financial Information [Line items]
Revenue			$ 1,535,676
Operating income			101,844
Convertible debt repurchase loss			(18,355)
Income Tax Expense (Benefit)			(13,324)
Net (loss) income attributable to Parsons Corporation			$ 39,750
(Loss) earnings per share:
Basic			$ 0.37
Diluted			$ 0.37
Before Adoption of ASU 2024-04
Selected Quarterly Financial Information [Line items]
Revenue			$ 1,535,676
Operating income			101,844
Convertible debt repurchase loss			(211,018)
Income Tax Expense (Benefit)			32,234
Net (loss) income attributable to Parsons Corporation			$ (92,112)
(Loss) earnings per share:
Basic			$ (1.01)
Diluted			$ (1.01)
Federal Solutions
Selected Quarterly Financial Information [Line items]
Revenue		$ 842,557	$ 909,608
Federal Solutions | ASU 2024-04
Selected Quarterly Financial Information [Line items]
Revenue			909,608
Federal Solutions | Before Adoption of ASU 2024-04
Selected Quarterly Financial Information [Line items]
Revenue			909,608
Critical Infrastructure
Selected Quarterly Financial Information [Line items]
Revenue		$ 711,803	626,068
Critical Infrastructure | ASU 2024-04
Selected Quarterly Financial Information [Line items]
Revenue			626,068
Critical Infrastructure | Before Adoption of ASU 2024-04
Selected Quarterly Financial Information [Line items]
Revenue			$ 626,068

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