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Share-Based Compensation - Unrecognized Share-Based Compensation Expense (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Unrecognized Share Based Compensation Expense [Line Items]  
Unrecognized Expense $ 44,536us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Stock options  
Unrecognized Share Based Compensation Expense [Line Items]  
Unrecognized Expense 12,436us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Average Expected Recognition Period - in Years 2 years 4 months 21 days
Restricted stock units  
Unrecognized Share Based Compensation Expense [Line Items]  
Unrecognized Expense $ 32,100us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Average Expected Recognition Period - in Years 2 years 4 months 24 days