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Income Taxes - Schedule of Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current provision:
Federal	$ 40,021	$ 38,957	$ 38,881
State	17,040	15,968	13,996
Current provision, total	57,061	54,925	52,877
Deferred provision/(benefit):
Federal	(3,443)	2,534	(3,260)
State	(1,397)	1,317	(950)
Deferred provision (benefit), total	(4,840)	3,851	(4,210)
Provision for income taxes	$ 52,221	$ 58,776	$ 48,667

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