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Stock-Based Compensation (Detail) - (Table 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Proceeds from stock options exercised $ 16,807us-gaap_ProceedsFromStockOptionsExercised $ 521us-gaap_ProceedsFromStockOptionsExercised
Intrinsic value of stock options exercised $ 27,446us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue $ 586us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue