Regulatory Authorities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified			6 Months Ended
	Jun. 30, 2013 EGL [Member]	Dec. 31, 2012 EGL [Member]	Jun. 30, 2013 Evercore Trust Company [Member] D
Regulatory Authorities [Line Items]
Alternative Net Capital Requirement	$ 250
Net Capital	26,251	31,281
Alternative Excess Net Capital	26,001
Regulatory net capital exceeding minimum net capital requirement		27,871
Tier 1 capital			5,000
Minimum liquid assets, amount			3,500
Coverage of operating expenses (in days)			90
Collateral held in a segregated account at a third-party depository institution			$ 10,000