Income Taxes - Income Tax Benefit (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
U.S. Federal	$ (47,916)	$ 2,595	$ (2,228)
State	(12,226)	679	189
Foreign	4,310	2,004	1,340
Total current expense	(55,832)	88	(699)
Deferred:
U.S. Federal	(25,017)	(9,679)	(16,007)
State	3,009	(6,406)	(1,913)
Deferred tax valuation allowance	710	1,882
Foreign	(1,896)	(1,323)	(1,223)
Total deferred expense (benefit)	(23,194)	(15,526)	(19,143)
Total expense (benefit)	$ (79,026)	$ (15,438)	$ (19,842)