Income Taxes - Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current
Federal	$ 0	$ 0	$ 0
State	600	600	600
Foreign			100
Gross	600	600	700
Deferred
Federal	12,000	12,800	15,000
State	500	3,000	2,700
Gross	12,500	15,800	17,700
Total provision (benefit) for taxes	$ 13,121	$ 16,414	$ 18,444