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Income Taxes - Income Tax Expense (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Tax Disclosure [Abstract]        
Current income tax expense $ 16,960 $ 19,665 $ 49,048 $ 49,836
Deferred income tax expense (benefit) (4,830) (2,784) (12,234) (7,318)
Income tax expense, as reported $ 12,130 $ 16,881 $ 36,814 $ 42,518
Effective tax rate 13.80% 17.90% 14.30% 17.20%