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Summary of Stock Option (Detail) (USD $)
3 Months Ended
Mar. 31, 2015
Options  
Beginning balance 2,326,627us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Exercises (30,700)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Cancellations (19,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Ending balance 2,276,927us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options exercisable at End of Period 1,503,085us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Weighted-average exercise price  
Beginning balance $ 14.19us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Exercises $ 9.16us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Cancellations $ 15.09us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
Ending balance $ 14.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Options exercisable at End of Period $ 13.79us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Weighted-average remaining contractual life (years)  
Options outstanding, Ending balance 5 years 8 months 12 days
Options exercisable, Ending balance 4 years 7 months 6 days
Aggregate intrinsic value  
Options outstanding, end of period $ 7,304us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Options exercisable, end of period $ 5,922us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1