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Share Based Compensation - Summary of Total Unrecognized Compensation Cost Related to Stock-Based Compensation (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Compensation Cost $ 113,505us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Compensation Cost 74,540us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Weighted Average Period of Expense Recognition (in Years) 2 years
Restricted Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized Compensation Cost $ 38,965us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Weighted Average Period of Expense Recognition (in Years) 1 year 3 months