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Subsequent Events - Additional Information (Detail) (Chief Executive Officer [Member], Subsequent Event [Member], USD $)
In Thousands, unless otherwise specified
1 Months Ended
Jan. 31, 2015
Chief Executive Officer [Member] | Subsequent Event [Member]
 
Subsequent Event [Line Items]  
Share-based compensation expense $ 1,500us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember