Income Taxes - Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current
Federal	$ 200	$ (400)
State	500	600	$ 600
Foreign	1,500	500
Gross	2,200	700	600
Deferred
Federal	5,000	70,100	12,000
State	2,200	12,500	500
Foreign	(1,500)	(700)
Gross	5,700	81,900	12,500
Total provision (benefit) for taxes	$ 7,877	$ 82,612	$ 13,121