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Segment Operating Results Revenues Derived from Clients and Private Equity Funds by Geographical Areas (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]    
Net revenue $ 239,719evr_NetRevenuesExcludingOtherRevenueAndInterestExpense [1] $ 150,419evr_NetRevenuesExcludingOtherRevenueAndInterestExpense [1]
United States [Member]    
Segment Reporting Information [Line Items]    
Net revenue 161,822evr_NetRevenuesExcludingOtherRevenueAndInterestExpense
/ invest_InvestmentGeographicRegionAxis
= country_US		 [1] 107,927evr_NetRevenuesExcludingOtherRevenueAndInterestExpense
/ invest_InvestmentGeographicRegionAxis
= country_US		 [1]
Europe And Other [Member]    
Segment Reporting Information [Line Items]    
Net revenue 71,211evr_NetRevenuesExcludingOtherRevenueAndInterestExpense
/ invest_InvestmentGeographicRegionAxis
= evr_EuropeAndOtherMember		 [1] 36,788evr_NetRevenuesExcludingOtherRevenueAndInterestExpense
/ invest_InvestmentGeographicRegionAxis
= evr_EuropeAndOtherMember		 [1]
Latin America [Member]    
Segment Reporting Information [Line Items]    
Net revenue $ 6,686evr_NetRevenuesExcludingOtherRevenueAndInterestExpense
/ invest_InvestmentGeographicRegionAxis
= us-gaap_LatinAmericaMember		 [1] $ 5,704evr_NetRevenuesExcludingOtherRevenueAndInterestExpense
/ invest_InvestmentGeographicRegionAxis
= us-gaap_LatinAmericaMember		 [1]
[1] Excludes Other Revenue and Interest Expense.