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Net Income per Unit (Tables)
 3 Months Ended
Mar. 31, 2014
Net Income per Unit [Abstract]  
Earnings per unit, basic and diluted
Basic net income per unit is derived by reducing net income for the 1% general partnership interest and dividing the remaining 99% by the basic weighted average number of units outstanding for each period. Diluted net income per unit is derived by reducing net income for the 1% general partnership interest and dividing the remaining 99% by the total of the diluted weighted average number of units outstanding for each period.
 
 
Three Months Ended March 31,  
 
  
2014
  
2013
 
  
(in thousands, except per unit amounts)  
 
     
Net income attributable to AllianceBernstein Unitholders
 
$
116,725
  
$
114,516
 
 
        
Weighted average units outstanding – basic
  
268,459
   
277,786
 
Dilutive effect of compensatory options to buy Holding Units
  
1,077
   
937
 
Weighted average units outstanding – diluted
  
269,536
   
278,723
 
Basic net income per AllianceBernstein Unit
 
$
0.43
  
$
0.41
 
Diluted net income per AllianceBernstein Unit
 
$
0.43
  
$
0.41