Noncontrolling Interest - Schedule of Noncontrolling Interest (Details)	Sep. 30, 2019	Sep. 30, 2018
Evercore LP [Member]
Noncontrolling Interest [Line Items]
Noncontrolling Interest (as a percent)	12.00%	11.00%
Evercore Wealth Management [Member]
Noncontrolling Interest [Line Items]
Noncontrolling Interest (as a percent)	20.00%	44.00%
Private Capital Advisory L.P. (PCA) [Member]
Noncontrolling Interest [Line Items]
Noncontrolling Interest (as a percent)	0.00%	10.00%
Real Estate Capital Advisory [Member]
Noncontrolling Interest [Line Items]
Noncontrolling Interest (as a percent)	38.00%	38.00%