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Net Income Per Unit (Tables)
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
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 basic weighted average number of units outstanding and the dilutive unit equivalents resulting from outstanding compensatory options to buy Holding Units as follows:

 
   Three Months Ended
June 30,		   Six Months Ended
June 30,		  
 
   2013   2012   2013   2012  
 
   (in thousands, except per unit amounts)
  

Net income attributable to AllianceBernstein Unitholders

   $ 120,714   $ 74,185   $ 235,230   $ 161,463  
                   

Weighted average units outstanding—basic

     278,209     277,820     277,999     277,833  

Dilutive effect of compensatory options to buy Holding Units

     1,251     —     1,111     —  
                   

Weighted average units outstanding—diluted

     279,460     277,820     279,110     277,833  
                   

Basic net income per AllianceBernstein Unit

   $ 0.43   $ 0.26   $ 0.84   $ 0.58  
                   

Diluted net income per AllianceBernstein Unit

   $ 0.43   $ 0.26   $ 0.83   $ 0.58  
                   
Basic net income (loss) per unit is derived by reducing net income (loss) for the 1% general partnership interest and dividing the remaining 99% by the basic weighted average number of units outstanding for each year. Diluted net (loss) income per unit is derived by reducing net income (loss) for the 1% general partnership interest and dividing the remaining 99% by the total of the basic weighted average number of units outstanding and the dilutive unit equivalents resulting from outstanding compensatory options to buy Holding Units as follows:

 
 
Years Ended December 31,
 
 
 
2012
 
 
2011
 
 
2010
 
 
 
(in thousands, except per unit amounts)
 
 
 
 
 
 
 
 
 
 
 
Net income (loss) attributable to AllianceBernstein Unitholders
 
$
188,916
 
 
$
(174,768
)
 
$
442,419
 
 
 
 
   
 
 
 
 
 
 
 
 
Weighted average units outstanding—basic
 
 
277,721
 
 
 
278,018
 
 
 
275,415
 
Dilutive effect of compensatory options to buy Holding Units
 
 
1
 
 
 
—
 
 
 
1,639
 
Weighted average units outstanding—diluted
 
 
277,722
 
 
 
278,018
 
 
 
277,054
 
 
 
 
   
 
 
 
 
 
 
 
 
Basic net income (loss) per AllianceBernstein Unit
 
$
0.67
 
 
$
(0.62
)
 
$
1.59
 
Diluted net income (loss) per AllianceBernstein Unit
 
$
0.67
 
 
$
(0.62
)
 
$
1.58