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Employee Retirement Plan - Additional information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]      
Discretionary contribution to 401(k) plan $ 71us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount $ 1,868us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount $ 2,853us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of discretionary matching contribution based on employee deferral 25.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 40.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ us-gaap_RangeAxis
= us-gaap_MaximumMember