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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Tax Disclosure [Abstract]    
Provision for Income Taxes $ 6,212us-gaap_IncomeTaxExpenseBenefit $ 7,563us-gaap_IncomeTaxExpenseBenefit
Effective Income Tax Rate Reconciliation, Percent 51.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 36.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Increase (decrease) in deferred tax assets, changes in unrealized gain (loss) on marketable securities 445evr_IncreaseDecreaseInDeferredTaxAssetsAssociatedWithChangesInUnrealizedGainLossOnMarketableSecuritiesInAccumulatedOtherComprehensiveIncomeLoss (535)evr_IncreaseDecreaseInDeferredTaxAssetsAssociatedWithChangesInUnrealizedGainLossOnMarketableSecuritiesInAccumulatedOtherComprehensiveIncomeLoss
Increase (decrease) in deferred tax assets, changes in foreign currency translation adjustments $ 2,211evr_IncreaseDecreaseInDeferredTaxAssetsAssociatedWithChangesInForeignCurrencyTranslationAdjustmentGainLossInAccumulatedOtherComprehensiveIncomeLoss $ (136)evr_IncreaseDecreaseInDeferredTaxAssetsAssociatedWithChangesInForeignCurrencyTranslationAdjustmentGainLossInAccumulatedOtherComprehensiveIncomeLoss