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Share-Based Compensation - Unrecognized Compensation Expense and Weighted Average Period (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Stock Option [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unrecognized expense $ 1,485us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Weighted average remaining years 2 years 4 months 24 days
Restricted Stock [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unrecognized expense $ 3,413us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Weighted average remaining years 7 months 13 days