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Property and Equipment, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 241,853us-gaap_PropertyPlantAndEquipmentGross $ 149,088us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation and amortization (38,826)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (40,311)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property plant and equipment, net 203,027us-gaap_PropertyPlantAndEquipmentNet 108,777us-gaap_PropertyPlantAndEquipmentNet
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 22,315us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember		 25,714us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 196,027us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember		 99,908us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
Equipment and furniture    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 23,511us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= aria_EquipmentAndFurnitureMember		 $ 23,466us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= aria_EquipmentAndFurnitureMember