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Income Taxes - Schedule of Income Tax Expense (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current provision:      
Federal $ 41,195 $ 40,021 $ 38,957
State 17,944 17,040 15,968
Current provision, total 59,139 57,061 54,925
Deferred provision/(benefit):      
Federal 1,208 (3,443) 2,534
State 510 (1,397) 1,317
Deferred provision (benefit), total 1,718 (4,840) 3,851
Provision for income taxes $ 60,857 $ 52,221 $ 58,776