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Net Income per Unit (Tables)
 3 Months Ended
Mar. 31, 2015
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,
 
 
2015
 
2014
 
 
(in thousands, except per unit amounts)
 
   
Net income attributable to AB Unitholders
 
$
141,469
  
$
116,725
 
         
Weighted average units outstanding – basic
  
272,831
   
268,459
 
Dilutive effect of compensatory options to buy AB Holding Units
  
1,098
   
1,077
 
Weighted average units outstanding – diluted
  
273,929
   
269,536
 
Basic net income per AB Unit
 
$
0.51
  
$
0.43
 
Diluted net income per AB Unit
 
$
0.51
  
$
0.43