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Supplemental Cash Flow Information - Schedule of Effect of Changes in Operating Assets and Liabilities, Net Of Non-Cash Transactions, On Cash Flows From Operating Activities of Continuing Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Supplemental Cash Flow Elements [Abstract]
Accounts and notes receivable	$ (272,131)	$ (177,832)	$ (398,574)	$ 86,562
Costs and estimated earnings in excess of billings on uncompleted contracts	20,981	(35,075)	(126,999)	(169,998)
Inventories	13,525	(12,405)	8,727	(10,124)
Prepaid expenses and other current assets	10,495	19,664	(23,142)	7,977
Accounts payable and accrued expenses and other non-current liabilities	203,743	105,362	217,384	115,686
Billings in excess of costs and estimated earnings on uncompleted contracts	43,836	(78,306)	80,042	(90,833)
Other, net	(6,621)	(6,486)	12,221	(7,485)
Net change in operating assets and liabilities, net of non-cash transactions	$ 13,828	$ (185,078)	$ (230,341)	$ (68,215)

X

- Definition

The increase (decrease) during the reporting period of the sum of amounts due within one year (or one business cycle) from customers for the credit sale of goods and services; and from note holders for outstanding loans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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- Definition

The increase (decrease) during the reporting period in the liability reflecting cash payments received before the related costs have been incurred.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
-Paragraph 28
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- Definition

The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Section 45
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The increase (decrease) during the reporting period of all assets and liabilities used in operating activities.

+ References

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The increase (decrease) during the reporting period in other obligations or expenses incurred but not yet paid.

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-Topic 230
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Amount of increase (decrease) in operating liabilities classified as other.

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Amount of increase (decrease) in prepaid expenses, and assets classified as other.

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The increase (decrease) during the reporting period of the amount of revenue for work performed for which billing has not occurred, net of uncollectible accounts.

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