Regulatory Authorities - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
EGL [Member]
Regulatory Authorities [Line Items]
Alternative Net Capital Requirement	$ 250,000
Net Capital	70,081,000	$ 79,019,000
Alternative excess net capital	69,831,000	$ 78,769,000
Evercore Trust Company [Member]
Regulatory Authorities [Line Items]
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