Regulatory Authorities - Additional Information (Detail) (USD $)			9 Months Ended
	Sep. 30, 2014 EGL [Member]	Dec. 31, 2013 EGL [Member]	Sep. 30, 2014 Evercore Trust Company [Member]
Regulatory Authorities [Line Items]
Alternative Net Capital Requirement	$ 250,000
Net Capital	61,192,000	30,480,000
Alternative excess net capital	60,942,000	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