Marketable Securities Amortized Cost and Estimated Fair Value of Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Total
Cost	$ 39,133evr_MarketableSecuritiesAmortizedCost	$ 41,727evr_MarketableSecuritiesAmortizedCost
Gross Unrealized Gains	1,144evr_MarketableSecuritiesUnrealizedGain	2,441evr_MarketableSecuritiesUnrealizedGain
Gross Unrealized Losses	2,292evr_MarketableSecuritiesUnrealizedLoss	761evr_MarketableSecuritiesUnrealizedLoss
Fair Value	37,985us-gaap_MarketableSecurities	43,407us-gaap_MarketableSecurities
Securities Investments [Member]
Securities Investments
Cost	6,354	11,268
Gross Unrealized Gains	11	754
Gross Unrealized Losses	2,173	623
Fair Value	4,192	11,399
Debt Securities Carried by EGL [Member]
Other Securities
Cost	28,014	22,542
Gross Unrealized Gains	80	87
Gross Unrealized Losses	3	1
Fair Value	28,091	22,628
Mutual Funds [Member]
Other Securities
Cost	4,765	7,917
Gross Unrealized Gains	1,053	1,600
Gross Unrealized Losses	116	137
Fair Value	$ 5,702	$ 9,380

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