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Components of Income Tax Expense (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current tax expense (benefit):                      
Federal                 $ (254) $ 7,234 $ 12,819
State                 581 1,325 1,743
Total current tax expense                 327 8,559 14,562
Deferred tax expense (benefit):                      
Federal                 10,034 2,971 (3,136)
State                 1,020 794 (518)
Total deferred tax expense (benefit)                 11,054 3,765 (3,654)
Total income tax expense $ 2,993 $ 3,084 $ 2,467 $ 2,837 $ 2,931 $ 3,609 $ 3,223 $ 2,561 $ 11,381 $ 12,324 $ 10,908