Income Taxes - (Benefit) Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Federal:
Current	$ (1)	$ 72
Deferred	(2,962)	193
Gross Federal	(2,963)	265
State:
Current	100	49
Deferred	(6)	4
Gross State	94	53
Income tax expense (benefit)	$ (2,869)	$ 318