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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the non-primary beneficiary (directly or indirectly).

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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Variable Interest Entities (VIEs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Variable Interest Entity [Line Items]
Assets, Current	$ 3,605,582		$ 3,605,582		$ 3,175,643
Liabilities, Current	1,920,708		1,920,708		1,597,966
REVENUE	1,189,345	$ 1,123,137	3,273,107	$ 3,271,378
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets, Current	372,600		372,600		173,900
Assets, Noncurrent	56,800		56,800		51,500
Liabilities, Current	526,800		$ 526,800		319,900
Parsons Corporation (“Parsons”) [Member] \| Newark Airport Terminal One Design-Build Project [Member]
Variable Interest Entity [Line Items]
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] \| Plan [Member]
Variable Interest Entity [Line Items]
REVENUE			$ 1,400,000
O&G [Member] \| Purple Line Segment 2 Expansion Project [Member]
Variable Interest Entity [Line Items]
Related party's ownership percentage in joint venture			25.00%
Percent interest in the joint venture			75.00%
O&G [Member] \| Purple Line Extension Section 2 And Section 3 [Member] \| Plan [Member]
Variable Interest Entity [Line Items]
REVENUE			$ 2,800,000
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets, Current	500		500		4,000
Liabilities, Current	$ 400		$ 400		$ 3,800