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Stockholders' Equity - Summary of Stock Option Activity (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Number of Shares, Outstanding at December 31, 2014 1,954us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Number of Shares, Granted 44us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Number of Shares, Exercised (20)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Number of Shares, Forfeited (55)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Number of Shares, Outstanding at March 31, 2015 1,923us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Number of Shares, Exercisable at March 31, 2015 875us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableNumber
Number of Shares, Vested and expected to vest at March 31, 2015 1,822us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
Weighted - Average Exercise Price Per Share, Outstanding, Beginning balance $ 33.81us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Weighted - Average Exercise Price Per Share, Granted $ 38.64us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Weighted - Average Exercise Price Per Share, Exercised $ 28.58us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Weighted - Average Exercise Price Per Share, Forfeited $ 36.46us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
Weighted - Average Exercise Price Per Share, Outstanding, Ending balance $ 33.90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Weighted - Average Exercise Price Per Share, Exercisable at March 31, 2015 $ 30.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice
Weighted Average Exercise Price Per Share, Vested and expected to vest at March 31, 2015 $ 33.72us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
Weighted - Average Remaining Contractual Term, Outstanding at March 31, 2015 6 years 10 months 17 days
Weighted - Average Remaining Contractual Term, Exercisable at March 31, 2015 4 years 10 months 24 days
Weighted - Average Remaining Contractual Term, Vested and expected to vest at March 31, 2015 6 years 9 months 7 days
Aggregate Intrinsic Value, Outstanding at March 31, 2015 $ 6,536us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Aggregate Intrinsic Value, Exercisable at March 31, 2015 5,452us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
Aggregate Intrinsic Value, Vested and expected to vest at March 31, 2015 $ 6,466us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue