Quarterly report pursuant to Section 13 or 15(d)

Accrued Expenses (Details)

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Accrued Expenses (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Components of accrued expenses    
Accrued investment manager fees $ 26,433env_AccruedInvestmentManagerFees $ 25,195env_AccruedInvestmentManagerFees
Accrued compensation and related taxes 13,931us-gaap_EmployeeRelatedLiabilitiesCurrent 18,344us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued professional services 697us-gaap_AccruedProfessionalFeesCurrent 536us-gaap_AccruedProfessionalFeesCurrent
Estimated accrued software license fees 800env_AccruedSoftwareLicenseFees 800env_AccruedSoftwareLicenseFees
Other accrued expenses 5,285us-gaap_OtherAccruedLiabilitiesCurrent 3,372us-gaap_OtherAccruedLiabilitiesCurrent
Total accrued expenses $ 47,146us-gaap_AccruedLiabilitiesCurrent $ 48,247us-gaap_AccruedLiabilitiesCurrent