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Employee Benefit Plans Employee Benefit Plans (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Payment for Pension Benefits   $ 124,000 $ 137,000 $ 165,000
Evercore Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined Contribution Plan, Employer Discretionary Contribution Amount   0 0 0
Evercore Plan [Member] | Subsequent Event [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 100.00%      
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay (as a percent) 3.00%      
Defined Contribution Plan, Employer Matching Contribution, Maximum Annual Contributions Per Employee, Amount $ 3,000      
Evercore Europe Plan [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined Contribution Plan, Employer Discretionary Contribution Amount   $ 2,972,000 $ 2,915,000 $ 3,145,000
Defined Contribution Plan, Maximum Annual Contributions Per Employee, (as a percent)   10.00%    
Evercore Europe Plan [Member] | Minimum [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay (as a percent)   5.00%    
Defined Contribution Plans Annual Contribution Percentage of Employee's Salary (as a percent)   15.00%    
Defined Contribution Plan Contribution Percentage By Employee (as a percent)   7.50%    
Evercore Europe Plan [Member] | Maximum [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay (as a percent)   10.00%    
Defined Contribution Plans Annual Contribution Percentage of Employee's Salary (as a percent)   50.00%    
Defined Contribution Plan Contribution Percentage By Employee (as a percent)   10.00%    
Evercore Europe Plan After July 2011 [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined Contribution Plans Annual Contribution Percentage of Employee's Salary (as a percent)   15.00%    
ISI U.K. Plan Through March 2018 [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Pension Contributions, Percent of Employees Salary (as a percent)   5.00%    
ISI U.K. Plan Starting in April 2018 [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Pension Contributions, Percent of Employees Salary (as a percent)   6.00%