Supplemental Financial Information - Noncash Investing and Financing Activities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Accrued but unpaid capital expenditures at period end	$ 29,902	$ 14,104
Common stock withheld for payroll tax obligations	844	733
Cash interest payments	19,688	19,688
Foreign [Member]
Cash income taxes paid, net of (refunds):
Cash income taxes paid, net of refunds	8,700	2,033
State [Member]
Cash income taxes paid, net of (refunds):
Cash income taxes paid, net of refunds	$ (15)	$ 2