Income Taxes - Expense (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current tax provision:
Federal	$ 736	$ 610	$ 541
State	1,880	1,259	543
Foreign	6,577	6,135	7,289
Current tax provision (benefit)	9,193	8,004	8,373
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal	14,844	20,746	(129,405)
State	1,086	(1,127)	(10,693)
Foreign	895	(1,235)	(836)
Deferred tax expense (benefit)	16,825	18,384	(140,934)
Income tax provision	$ 26,018	$ 26,388	$ (132,561)