Income Taxes - Schedule of Components of Income Tax Provision (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal	$ 19,879	$ 8,610	$ 12,661
State	154	68	157
Total current tax provision	20,033	8,678	12,818
Deferred State and Local Income Tax Expense (Benefit)	5,846	12,158	4,862
Deferred State and Local Income Tax Expense (Benefit)	(240)	0	0
Deferred Income Tax Expense (Benefit)	5,606	12,158	4,862
Total tax provision (benefit), Amount	$ 25,639	$ 20,836	$ 17,680