Quarterly report pursuant to Section 13 or 15(d)

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

v3.5.0.2
Income Taxes - Summary of Income Tax Expense and Effective Tax Rate (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Tax Disclosure [Abstract]        
Income tax expense $ 24,376 $ 15,839 $ 67,144 $ 60,342
Effective tax rate 24.20% 17.70% 19.90% 21.30%