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Net Income per Unit (Tables)
 6 Months Ended
Jun. 30, 2013
Net Income per Unit [Abstract]  
Net (Loss) Income Per Unit
Basic net income per unit is derived by dividing net income by the basic weighted average number of units outstanding for each period. Diluted net income per unit is derived by adjusting net income for the assumed dilutive effect of compensatory options (“Net income – diluted”) and dividing by the diluted weighted average number of units outstanding for each period.
 
 
 
Three Months Ended June 30,
  
Six Months Ended June 30,
 
 
 
2013
  
2012
  
2013
  
2012
 
 
 
(in thousands, except per unit amounts)
 
 
            
Net income – basic
 
$
40,276
  
$
21,339
  
$
78,507
  
$
48,038
 
Additional allocation of equity in net income attributable to AllianceBernstein resulting from assumed dilutive effect of compensatory options
  
341
   
—
   
592
   
—
 
Net income – diluted
 
$
40,617
  $
21,339
  
$
79,099
  
$
48,038
 
 
                
Weighted average units outstanding – basic
  
100,888
   
101,424
   
100,595
   
101,595
 
Dilutive effect of compensatory options
  
1,251
   
—
   
1,111
   
—
 
Weighted average units outstanding – diluted
  
102,139
   
101,424
   
101,706
   
101,595
 
                 
Basic net income per unit
 
$
0.40
  
$
0.21
  
$
0.78
  
$
0.47
 
Diluted net income per unit
 
$
0.40
  
$
0.21
  
$
0.78
  
$
0.47