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Restructuring Charges (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]    
Restructuring charges $ 1,236us-gaap_RestructuringAndRelatedCostIncurredCost $ 227us-gaap_RestructuringAndRelatedCostIncurredCost
Termination and severance related    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges 683us-gaap_RestructuringAndRelatedCostIncurredCost
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember		  
Lease abandonment and termination    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges $ 553us-gaap_RestructuringAndRelatedCostIncurredCost
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_ContractTerminationMember		 $ 227us-gaap_RestructuringAndRelatedCostIncurredCost
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_ContractTerminationMember