Quarterly report pursuant to Section 13 or 15(d)

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

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Income Taxes - Summary of Income Taxes Expense and Effective Tax Rates (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Income Tax Disclosure [Abstract]    
Income tax expense $ 11,437 $ 2,278
Effective tax rate 25.70% 23.10%