Consolidated Income Tax Expense (benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current
Federal	$ 58,090	$ 19,036	$ 158
State	8,627	1,805	717
Foreign	54	118	130
Current Income Tax Expense (Benefit), Total	66,771	20,959	1,005
Deferred
Federal	(7,930)	12,913	26,792
State	288	3,778	3,412
Foreign	(107)	(118)	(115)
Deferred Income Tax Expense (Benefit), Total	(7,749)	16,573	30,089
Total income tax expense	$ 59,022	$ 37,532	$ 31,094