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Net Income (Loss) Per Unit
 12 Months Ended
Dec. 31, 2012
Net Income (Loss) Per Unit [Abstract]  
Net Income (Loss) Per Unit
3. Net Income (Loss) Per Unit

Basic net income (loss) per unit is derived by dividing net income (loss) by the basic weighted average number of units outstanding for each year. Diluted net income (loss) per unit is derived by adjusting net income (loss) for the assumed dilutive effect of compensatory options ("Net income (loss) - diluted") and dividing by the diluted weighted average number of units outstanding for each year.

 
 
Years Ended December 31,
 
 
 
2012
 
 
2011
 
 
2010
 
 
 
(in thousands,
except per unit amounts)
 
 
 
 
 
 
 
 
 
 
 
Net income (loss) - basic
 
$
51,085
 
 
$
(93,268
)
 
$
134,158
 
Additional allocation of equity in net income (loss) attributable to AllianceBernstein resulting from assumed dilutive effect of compensatory options
 
 
—
 
 
 
—
 
 
 
1,640
 
Net income (loss) - diluted
 
$
51,085
 
 
$
(93,268
)
 
$
135,798
 
 
 
 
   
 
 
 
 
 
 
 
 
Weighted average units outstanding - basic
 
 
101,067
 
 
 
103,288
 
 
 
101,162
 
Dilutive effect of compensatory options
 
 
1
 
 
 
—
 
 
 
1,639
 
Weighted average units outstanding - diluted
 
 
101,068
 
 
 
103,288
 
 
 
102,801
 
 
 
 
   
 
 
 
 
 
 
 
 
Basic net income (loss) per unit
 
$
0.51
 
 
$
(0.90
)
 
$
1.33
 
Diluted net income (loss) per unit
 
$
0.51
 
 
$
(0.90
)
 
$
1.32
 

As of 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. Weighted average units outstanding do not include Holding's proportional shares (37.5% in 2012, 37.5% in 2011 and 36.7% in 2010) of the Holding Units held by AllianceBernstein in its consolidated rabbi trust.

The 2012 net income per unit includes the impact of AllianceBernstein's $223.0 million non-cash real estate charges recorded in 2012 in regard to its global space consolidation plan.

The 2011 net loss per unit includes the impact of AllianceBernstein's one-time, non-cash long-term incentive 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.