XML 32 R20.htm IDEA: XBRL DOCUMENT v3.10.0.1
Business Description, Organization and Basis of Presentation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 01, 2018
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
Ownership structure of AB Holding        
Units outstanding (in units)   100,000 100,000 100,000
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09        
Ownership structure of AB Holding        
Cumulative effect adjustment, net of tax, to partner's capital $ 12,500 $ 12,549 $ 12,549  
AllianceBernstein Corporation        
Ownership structure of AB Holding        
Limited partners or members ownership interest in Company (percent)     100.00%  
AB | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09        
Ownership structure of AB Holding        
Cumulative effect adjustment, net of tax, to partner's capital $ 35,000      
EQH | AXA        
Ownership structure of AB Holding        
General partnership interest (percent)   72.00%    
AB Holding | EQH        
Ownership structure of AB Holding        
General partnership interest (percent)   3.90%    
AB Holding | AllianceBernstein Corporation        
Ownership structure of AB Holding        
General partnership interest (percent)     1.00%  
Units outstanding (in units)   100,000 100,000  
Limited partners or members ownership interest in Company (percent)     35.50%  
EQH and its subsidiaries | AllianceBernstein Corporation        
Ownership structure of AB Holding        
Limited partners or members ownership interest in Company (percent)     63.70%  
Unaffiliated holders | AllianceBernstein Corporation        
Ownership structure of AB Holding        
Limited partners or members ownership interest in Company (percent)     0.80%  
AB | EQH and its subsidiaries        
Ownership structure of AB Holding        
General partnership interest (percent)     65.10%  
AB | AB Holding        
Ownership structure of AB Holding        
Limited partners or members ownership interest in Company (percent) 35.50%