Supplemental Financial Information - Noncash Investing and Financing Activities (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Condensed Financial Statements, Captions [Line Items]
Accrued but unpaid capital expenditures at period end	$ 65,286	$ 42,325
Common stock withheld for payroll tax obligations	181	236
Cash interest payments	53,433	57,625
U.S Federal [Member]
Cash income taxes paid, net of (refunds):
Cash income taxes paid, net of refunds		(3,344)
Foreign [Member]
Cash income taxes paid, net of (refunds):
Cash income taxes paid, net of refunds	33,479	53,292
State [Member]
Cash income taxes paid, net of (refunds):
Cash income taxes paid, net of refunds	$ 1	$ 150