Annual report pursuant to Section 13 and 15(d)

Property and Equipment (Details)

v2.4.1.9
Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Property and equipment, cost:      
Property and equipment, gross $ 34,482us-gaap_PropertyPlantAndEquipmentGross $ 34,482us-gaap_PropertyPlantAndEquipmentGross $ 40,073us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation and amortization (17,853)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (17,853)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (27,307)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 16,629us-gaap_PropertyPlantAndEquipmentNet 16,629us-gaap_PropertyPlantAndEquipmentNet 12,766us-gaap_PropertyPlantAndEquipmentNet
Cost written off 18,207us-gaap_PropertyPlantAndEquipmentDisposals    
Accumulated Depreciation written off (18,207)us-gaap_AccumulatedDepreciationDepletionAndAmortizationSaleOfPropertyPlantAndEquipment    
Office furniture and fixtures      
Property and equipment, cost:      
Property and equipment, gross 4,993us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
4,993us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
4,266us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Cost written off 721us-gaap_PropertyPlantAndEquipmentDisposals
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
   
Accumulated Depreciation written off (721)us-gaap_AccumulatedDepreciationDepletionAndAmortizationSaleOfPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
   
Office furniture and fixtures | Minimum      
Property and equipment, cost:      
Estimated Useful Life   5 years  
Office furniture and fixtures | Maximum      
Property and equipment, cost:      
Estimated Useful Life   7 years  
Computer equipment and software      
Property and equipment, cost:      
Estimated Useful Life   3 years  
Property and equipment, gross 18,540us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= env_ComputerEquipmentAndSoftwareMember
18,540us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= env_ComputerEquipmentAndSoftwareMember
26,910us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= env_ComputerEquipmentAndSoftwareMember
Cost written off 15,455us-gaap_PropertyPlantAndEquipmentDisposals
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= env_ComputerEquipmentAndSoftwareMember
   
Accumulated Depreciation written off (15,455)us-gaap_AccumulatedDepreciationDepletionAndAmortizationSaleOfPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= env_ComputerEquipmentAndSoftwareMember
   
Other office equipment      
Property and equipment, cost:      
Estimated Useful Life   5 years  
Property and equipment, gross 144us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
144us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
598us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
Cost written off 596us-gaap_PropertyPlantAndEquipmentDisposals
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
   
Accumulated Depreciation written off (596)us-gaap_AccumulatedDepreciationDepletionAndAmortizationSaleOfPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
   
Leasehold improvements      
Property and equipment, cost:      
Property and equipment, gross 10,805us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
10,805us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
8,299us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
Cost written off 1,435us-gaap_PropertyPlantAndEquipmentDisposals
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
   
Accumulated Depreciation written off $ (1,435)us-gaap_AccumulatedDepreciationDepletionAndAmortizationSaleOfPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember