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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
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Supplemental Cash Flow Elements [Abstract]      
Accounts and notes receivable $ (425,313) $ 144,877 $ 150,470
Costs and estimated earnings in excess of billings on uncompleted contracts 15,999 (152,702) (49,358)
Inventories 14,110 (9,905) (33,524)
Prepaid expenses and other current assets (32,079) 25,133 5,899
Accounts payable and accrued expenses and other non-current liabilities 29,722 81,792 7,311
Billings in excess of costs and estimated earnings on uncompleted contracts 139,114 (124,680) 153,017
Other, net 17,267 (13,743) (11,707)
Net change in operating assets and liabilities, net of non-cash transactions $ (241,180) $ (49,228) $ 222,108