Variable Interest Entities (VIE) (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Assets, Current	$ 3,112,500		$ 3,074,392
Liabilities, Current	1,559,438		1,581,846
REVENUE	1,028,156	$ 1,117,361
Variable Interest Entity, Primary Beneficiary [Member]
Assets, Current	130,800		95,500
Assets, Noncurrent	25,100		11,600
Liabilities, Current	$ 211,000		140,700
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	2,400		800
Liabilities, Current	$ 2,400		$ 800

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