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, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Tax Disclosure [Abstract]        
Income tax expense $ 12,682 $ 14,059 $ 36,351 $ 20,970
Effective tax rate 18.70% 33.20% 22.30% 31.90%