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Units Outstanding
9 Months Ended
Sep. 30, 2012
Units Outstanding [Abstract]  
Units Outstanding
11.      Units Outstanding

Changes in units outstanding during the nine-month period ended September 30, 2012 were as follows:

Outstanding as of December 31, 2011
  277,847,588 
Options exercised
   
Units issued
   
Units retired
  (238,487 )
Units forfeited
   
Outstanding as of September 30, 2012
  277,609,101 

During the first nine months of 2012, we purchased 238,487 AllianceBernstein Units in private transactions and retired them.