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Net Income (Loss) Per Unit
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Net Income Per Unit [Abstract]    
Net Income (Loss) Per Unit

6. Net Income Per Unit

        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  
                   

        For the three months and six months ended June 30, 2013, we excluded 2,979,935 options from the diluted net income per unit computation due to their anti-dilutive effect. For the three months and six months ended June 30, 2012, we excluded 9,036,845 options from the diluted net income per unit computation due to their anti-dilutive effect.
4. Net Income (Loss) Per Unit

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
 

For the years ended December 31, 2012, 2011 and 2010, we excluded 8,438,902, 3,813,567 and 4,783,472 options, respectively, from the diluted net income (loss) per unit computation due to their anti-dilutive effect.

The 2012 net income per unit includes $223.0 million of non-cash real estate charges recorded in 2012. See further discussion above in Note 3, Real Estate Charges.

The 2011 net (loss) per unit includes the one-time, non-cash compensation charge of $587.1 million recorded in the fourth quarter of 2011. See further discussion above in Note 2, Long-term Incentive Compensation Plans.