Quarterly report pursuant to Section 13 or 15(d)

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)

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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Supplemental Cash Flow Elements [Abstract]        
Accounts and notes receivable $ (45,089) $ (31,605) $ (176,801) $ (126,443)
Contract assets (56,934) (67,270) (63,118) (147,980)
Inventories 8,277 (3,529) (5,405) (4,798)
Prepaid expenses and other current assets (39,251) (29,355) (57,993) (33,637)
Accounts payable and accrued expenses and other non-current liabilities 151,001 (55,723) 123,790 13,044
Contract liabilities (6,212) 48,020 71,062 36,206
Other, net (8,642) 12,388 (5,979) 19,434
Net change in operating assets and liabilities, net of non-cash transactions $ 3,150 $ (127,074) $ (114,444) $ (244,174)