Income Taxes - Schedule of Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current income taxes:
Federal	$ 49,529	$ 26,939	$ (94,983)
State	5,728	1,987	1,255
Foreign	879	513	723
Total current income tax expense (benefit)	56,136	29,439	(93,005)
Deferred income taxes:
Federal	15,164	(34,620)	54,015
State	10,734	(48)	6,894
Total deferred income tax expense (benefit)	25,898	(34,668)	60,909
Total income tax expense (benefit)	82,034	(5,229)	(32,096)
Income tax benefit related to discontinued operation	$ 500	$ 500	$ 900