Regulatory Authorities - Additional Information (Detail) (USD $)			9 Months Ended
	Sep. 30, 2013 EGL [Member]	Dec. 31, 2012 EGL [Member]	Sep. 30, 2013 Evercore Trust Company [Member]
Regulatory Authorities [Line Items]
Alternative Net Capital Requirement	$ 250,000
Net Capital	84,193,000	31,281,000
Alternative excess net capital	83,943,000
Regulatory net capital exceeding minimum net capital requirement		27,871,000
Tier 1 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