Variable Interest Entities (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Assets, Current	$ 3,720,898		$ 3,510,986
Liabilities, Current	2,290,455		2,109,856
REVENUE	1,250,729	$ 958,487
Variable Interest Entity, Not Primary Beneficiary [Member]
Assets, Current	700		1,500
Liabilities, Current	700		1,400
Variable Interest Entity, Primary Beneficiary [Member]
Assets, Current	339,100		365,000
Assets, Noncurrent	43,300		52,000
Liabilities, Current	$ 531,900		$ 556,100
Parsons Corporation Parsons [Member] \| Newark Airport Terminal One Design Build Project [Member]
Percent interest in the joint venture	80.00%
Noncontrolling interest party's ownership percentage	20.00%
Parsons Corporation Parsons [Member] \| Newark Airport Terminal One Design Build Project [Member] \| Scenario, Plan [Member]
REVENUE	$ 1,400,000
O&G \| Purple Line Segment 2 Expansion Project [Member]
Related party's ownership percentage in joint venture	25.00%
Percent interest in the joint venture	75.00%
O&G \| Purple Line Extension Section 2 And Section 3 [Member] \| Scenario, Plan [Member]
REVENUE	$ 2,800,000

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