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Summary of Option Activity (Parenthetical) (Detail) (USD $) | 3 Months Ended
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Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Weighted Average Price Per Share, Option exercised | $ 7.50 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Weighted Average Price Per Share, Option forfeited | $ 11.49 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
Minimum |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Weighted Average Price Per Share, Option forfeited | $ 11.49 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Weighted Average Price Per Share, Option forfeited | $ 13.24 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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- Definition Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. + References No definition available. + Details
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