Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details 2)

v2.4.1.9
Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Income taxes    
Unrecognized tax benefits that would impact effective tax rate, if recognized $ 1,962us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate  
Reasonably possible decrease in liability for unrecognized tax benefits in the next twelve months 1,217us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound  
Accrued interest and penalties on unrecognized tax benefits 568us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 594us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Accrued expenses and other non-current liabilities    
Income taxes    
Liability for unrecognized tax benefits 2,081us-gaap_UnrecognizedTaxBenefits
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2,092us-gaap_UnrecognizedTaxBenefits
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Prepaid Expenses and Other Current Assets    
Income taxes    
Stock Based Compensation, Excess Tax Benefits $ 13,355env_StockBasedCompensationExcessTaxBenefits
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