Income Taxes - Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Federal:
Current		$ (30)		$ 21
Deferred	$ (162)	(1,467)	$ (13,789)	(1,065)
Gross Federal	(162)	(1,497)	(13,789)	(1,044)
State:
Current	149	43	308	277
Deferred	19	(52)	(90)	(46)
Gross State	168	(9)	218	231
Income tax expense (benefit)	$ 6	$ (1,506)	$ (13,571)	$ (813)