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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Unrecognized tax benefits $ 2.3us-gaap_UnrecognizedTaxBenefits   $ 2.3us-gaap_UnrecognizedTaxBenefits
Estimated effective tax rates 37.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations 35.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations