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

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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

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