Income Taxes - Summary of Income Tax (Expense) Benefit (Detail) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal									$ (20,819)	$ (170)	$ (34,790)
State									(1,831)	1,448	(4,835)
Current income tax total									(22,650)	1,278	(39,625)
Deferred:
Federal									1,453	7,439	(308)
State									436	3,034	2,750
Deferred income tax total									1,889	10,473	2,442
Income tax benefit (expense)	$ 4,167	$ 4,695	$ 6,342	$ (3,453)	$ (5,276)	$ (14,427)	$ (11,330)	$ (6,150)	$ (20,761)	$ 11,751	$ (37,183)