Income Taxes - Schedule of Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current income taxes:
Federal	$ 26,939	$ (94,983)	$ (52,601)
State	1,987	1,255	(9,477)
Foreign	513	723	6
Total current income tax expense (benefit)	29,439	(93,005)	(62,072)
Deferred income taxes:
Federal	(34,620)	54,015	15,051
State	(48)	6,894	4,696
Total deferred income tax expense (benefit)	(34,668)	60,909	19,747
Total income tax benefit	(5,229)	(32,096)	(42,325)
Income tax benefit related to discontinued operation	$ 500	$ 900	$ 431,000