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Noncontrolling Interest - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 29, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Noncontrolling Interest [Line Items]            
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest   $ (277) $ (453) $ (644) $ (780)  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Noncontrolling Interest   $ (572) $ (1,133) $ (2,053) $ (1,487)  
Evercore LP [Member]            
Noncontrolling Interest [Line Items]            
Noncontrolling Interest (as a percent)   14.00%   14.00%    
Evercore Wealth Management [Member]            
Noncontrolling Interest [Line Items]            
Noncontrolling Interest (as a percent)   38.00%   38.00%    
PCA [Member]            
Noncontrolling Interest [Line Items]            
Noncontrolling Interest (as a percent)   39.00%   39.00%    
Atalanta Sosnoff [Member]            
Noncontrolling Interest [Line Items]            
Noncontrolling Interest (as a percent)           34.00%
ECB [Member]            
Noncontrolling Interest [Line Items]            
Noncontrolling Interest (as a percent) 28.00%          
Purchase of Noncontrolling Interest $ 6,482          
GMP III [Member]            
Noncontrolling Interest [Line Items]            
Noncontrolling Interest, Decrease from Deconsolidation       $ 5,808