Variable Interest Entities (VIEs) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current assets	$ 3,862,492	$ 4,080,457
Current liabilities	1,777,113	2,264,363
REVENUE	$ 4,641,830	5,318,763	$ 4,450,832
O&G
Ownership percentage in joint venture	75.00%
Related party ownership percentage in joint venture	25.00%
Purple Line Expansion Section 2 And Section 3 \| O&G
REVENUE	$ 2,800,000
Purple Line Segment 2 Expansion Project \| O&G
Ownership percentage in joint venture	75.00%
Related party ownership percentage in joint venture	25.00%
Parsons Corporation \| Newark Liberty International Airport Terminal One Project
Ownership percentage in joint venture	80.00%
Variable interest ownership percentage in joint venture	20.00%
Parsons Corporation \| Newark Liberty International Airport Terminal One Project \| Scenario, Plan
REVENUE	$ 1,400,000
Variable Interest Entity, Not Primary Beneficiary
Current assets	700	600
Current liabilities	400	500
Variable Interest Entity, Primary Beneficiary
Current assets	568,200	405,700
Current liabilities	496,900	514,900
Noncurrent assets	$ 3,000	$ 14,200

Percentage represents the Company's ownership percentage in the joint venture.

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