Variable Interest Entities (VIEs) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Assets, Current	$ 3,301,505		$ 3,175,643
Liabilities, Current	1,583,274		1,597,966
REVENUE	958,487	$ 1,028,156
Variable Interest Entity, Primary Beneficiary [Member]
Assets, Current	172,600		173,900
Assets, Noncurrent	53,600		51,500
Liabilities, Current	$ 314,300		319,900
Parsons Corporation (“Parsons”) [Member] \| Newark Airport Terminal One Design-Build Project [Member]
Ownership percentage in joint venture	80.00%
Variable interest entity's ownership percentage in joint venture	20.00%
Parsons Corporation (“Parsons”) [Member] \| Newark Airport Terminal One Design-Build Project [Member] \| Plan [Member]
REVENUE	$ 1,400,000
O&G [Member] \| Purple Line Segment 2 Expansion Project [Member]
Ownership percentage in joint venture	75.00%
Related party's ownership percentage in joint venture	25.00%
O&G [Member] \| Purple Line Segment 2 Expansion Project [Member] \| Plan [Member]
REVENUE	$ 1,400,000
Variable Interest Entity, Not Primary Beneficiary [Member]
Assets, Current	800		4,000
Liabilities, Current	$ 500		$ 3,800

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