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Regulatory Authorities - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2014
EGL [Member]
Dec. 31, 2013
EGL [Member]
Mar. 31, 2014
Evercore Trust Company [Member]
Regulatory Authorities [Line Items]      
Alternative Net Capital Requirement $ 250,000    
Net Capital 37,140,000 30,480,000  
Alternative excess net capital 36,890,000 30,230,000  
Tier One Capital     5,000,000
Minimum liquid assets, amount     3,500,000
Coverage of operating expenses (in days)     90 days
Collateral held in a segregated account at a third-party depository institution     $ 10,000,000