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Summary of Equity-Based Compensation Activity (Detail)
 3 Months Ended
Mar. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Restricted Stock Units, Balance as of January 1, 2015 40,472us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
Restricted Stock Units, Granted 85,680us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted
Restricted Stock Units, Forfeited (2,904)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures
Restricted Stock Units, Balance as of March 31, 2015 123,248us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
Restricted Stock Units, Unvested 123,248us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Options, Balance as of January 1, 2015 652,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options, Exercised (263,568)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised [1]
Options, Balance as of March 31, 2015 388,932us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options, Vested 388,932us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
[1] Cash received from stock option exercises for the three months ended March 31, 2015 was $937,000. The Company recorded a corporate income tax benefit relating to the options exercised during the three months ended March 31, 2015 of $1,105,000 in “Additional paid-in capital” in the accompanying Condensed Consolidated Balance Sheets and Condensed Consolidated Statement of Stockholders’ Equity.