Income Taxes - (Benefit) Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Federal:
Current		$ (21)		$ 51
Deferred	$ (10,665)	209	$ (13,627)	402
Gross Federal	(10,665)	188	(13,627)	453
State:
Current	60	185	159	234
Deferred	(103)	2	(109)	6
Gross State	(43)	187	50	240
Income tax expense (benefit)	$ (10,708)	$ 375	$ (13,577)	$ 693