Marketable Securities Amortized Cost and Estimated Fair Value of Marketable Securities (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Total
Cost	$ 35,310evr_MarketableSecuritiesAmortizedCost	$ 39,133evr_MarketableSecuritiesAmortizedCost
Gross Unrealized Gains	406evr_MarketableSecuritiesUnrealizedGain	1,144evr_MarketableSecuritiesUnrealizedGain
Gross Unrealized Losses	3,294evr_MarketableSecuritiesUnrealizedLoss	2,292evr_MarketableSecuritiesUnrealizedLoss
Fair Value	32,422us-gaap_MarketableSecurities	37,985us-gaap_MarketableSecurities
Securities Investments [Member]
Securities Investments
Cost	6,390	6,354
Gross Unrealized Gains	10	11
Gross Unrealized Losses	3,265	2,173
Fair Value	3,135	4,192
Debt Securities Carried by EGL [Member]
Other Securities
Cost	27,628	28,014
Gross Unrealized Gains	77	80
Gross Unrealized Losses	0	3
Fair Value	27,705	28,091
Mutual Funds [Member]
Other Securities
Cost	1,292	4,765
Gross Unrealized Gains	319	1,053
Gross Unrealized Losses	29	116
Fair Value	$ 1,582	$ 5,702

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