Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Summary of Income Tax Expense and Effective Tax Rate (Detail)

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Income Taxes - Summary of Income Tax Expense and Effective Tax Rate (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]        
Income tax expense $ 15,839 $ 12,682 $ 60,342 $ 36,351
Effective tax rate 17.70% 18.70% 21.30% 22.30%