Quarterly report pursuant to Section 13 or 15(d)

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

v2.4.1.9
Income Taxes - Summary of Income Tax Expense and Effective Tax Rate (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Tax Disclosure [Abstract]    
Income tax expense $ 19,120us-gaap_IncomeTaxExpenseBenefit $ 11,437us-gaap_IncomeTaxExpenseBenefit
Effective tax rate 23.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations 25.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations