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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Tax Disclosure [Abstract]    
Provisions for income taxes $ 4,181us-gaap_IncomeTaxExpenseBenefit $ 7,654us-gaap_IncomeTaxExpenseBenefit
Percentage of pre-tax income 39.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 40.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations