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

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- Definition

Related Party's Ownership Percentage In Joint Venture

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Variable Interest Entity's Ownership Percentage In Joint Venture

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Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold or consumed after one year or beyond the normal operating cycle, if longer.

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Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Variable Interest Entities (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current assets	$ 4,080,457				$ 3,510,986				$ 4,080,457	$ 3,510,986
Current liabilities	2,264,363				2,109,856				2,264,363	2,109,856
REVENUE	1,349,516	$ 1,442,091	$ 1,276,427	$ 1,250,729	1,177,725	$ 1,189,345	$ 1,125,275	$ 958,487	$ 5,318,763	4,450,832	$ 4,454,662
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 [Member] \| 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 [Member] \| Newark Liberty International Airport Terminal One Project \| Scenario, Plan
REVENUE									$ 1,400,000
Variable Interest Entity, Not Primary Beneficiary
Current assets	600				1,500				600	1,500
Current liabilities	500				1,400				500	1,400
Variable Interest Entity, Primary Beneficiary
Current assets	405,700				365,000				405,700	365,000
Current liabilities	514,900				556,100				514,900	556,100
Noncurrent assets	$ 14,200				$ 52,000				$ 14,200	$ 52,000