Supplemental Financial Information - Noncash Investing and Financing Activities (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Condensed Financial Statements, Captions [Line Items]
Accrued but unpaid capital expenditures at period end	$ 32,916	$ 12,714
Common stock withheld for payroll tax obligations	1,369	1,265
Cash interest payments	56,531	56,531
Foreign [Member]
Cash income taxes paid, net of (refunds):
Cash income taxes paid, net of refunds	10,025	4,035
State [Member]
Cash income taxes paid, net of (refunds):
Cash income taxes paid, net of refunds	$ (15)	$ 2