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Financial Instruments Owned and Pledged as Collateral at Fair Value, Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase Summary of Assets, Liabilities and Collateral Received or Pledged (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Financial Instruments Owned and Pledged as Collateral at Fair Value $ 98,688us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral $ 56,311us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
Securities Purchased Under Agreements to Resell 7,669us-gaap_SecuritiesPurchasedUnderAgreementsToResell 19,134us-gaap_SecuritiesPurchasedUnderAgreementsToResell
Securities Sold Under Agreements to Repurchase (106,499)us-gaap_SecuritiesSoldUnderAgreementsToRepurchase (75,563)us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Asset (Liability) Balance [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Financial Instruments Owned and Pledged as Collateral at Fair Value 98,688us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= evr_AssetLiabilityBalanceMember		 56,311us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= evr_AssetLiabilityBalanceMember
Securities Purchased Under Agreements to Resell 7,669us-gaap_SecuritiesPurchasedUnderAgreementsToResell
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= evr_AssetLiabilityBalanceMember		 19,134us-gaap_SecuritiesPurchasedUnderAgreementsToResell
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= evr_AssetLiabilityBalanceMember
Total Assets 106,357evr_TotalFinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValueAndSecuritiesPurchasedUnderAgreementsToResell
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= evr_AssetLiabilityBalanceMember		 75,445evr_TotalFinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValueAndSecuritiesPurchasedUnderAgreementsToResell
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= evr_AssetLiabilityBalanceMember
Securities Sold Under Agreements to Repurchase (106,499)us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= evr_AssetLiabilityBalanceMember		 (75,563)us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= evr_AssetLiabilityBalanceMember
Market Value of Collateral Received or (Pledged) [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Securities Purchased Under Agreements to Resell 7,671us-gaap_SecuritiesPurchasedUnderAgreementsToResell
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= evr_MarketValueOfCollateralReceivedOrPledgedMember		 19,112us-gaap_SecuritiesPurchasedUnderAgreementsToResell
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= evr_MarketValueOfCollateralReceivedOrPledgedMember
Securities Sold Under Agreements to Repurchase $ (106,632)us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= evr_MarketValueOfCollateralReceivedOrPledgedMember		 $ (75,708)us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= evr_MarketValueOfCollateralReceivedOrPledgedMember