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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Supplemental Cash Flow Elements [Abstract]
Accounts and notes receivable	$ (177,832)	$ (59,739)	$ 86,562	$ 77,913
Costs and estimated earnings in excess of billings on uncompleted contracts	(35,075)	(11,828)	(169,998)	(78,597)
Inventories	(12,405)	(9,605)	(10,124)	(22,596)
Prepaid expenses and other current assets	19,664	14,305	7,977	4,729
Accounts payable and accrued expenses and other non-current liabilities	105,104	60,333	108,196	111,779
Billings in excess of costs and estimated earnings on uncompleted contracts	(78,306)	20,950	(90,833)	6,381
Other, net	(6,486)	(1,917)	(7,485)	(9,003)
Net change in operating assets and liabilities, net of non-cash transactions	$ (185,336)	$ 12,499	$ (75,705)	$ 90,606

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, 2016

Sep. 30, 2015

Sep. 30, 2016

Sep. 30, 2015

Supplemental Cash Flow Elements [Abstract]

Accounts and notes receivable

$ (177,832)

$ (59,739)

$ 86,562

$ 77,913