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Shareholders' Equity - Share-Based Compensation Arrangement by Share-Based Compensation Payment Award, Options, Exercisable (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Number of shares 4,300us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Option price Range, Lower $ 16.73us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
Option price Range, Upper $ 16.73us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
Weighted average exercise price $ 16.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Weighted average remaining contractual life 1 month 6 days