v3.26.1
Income Taxes - Schedule of Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Computation of equity in net income attributable to AllianceBernstein Unitholders [Abstract]        
Multiplied by: weighted average equity ownership interest 31.30% 37.50% 31.30% 37.50%
Equity in net income attributable to AB Unitholders $ 79,997 $ 78,830 $ 172,252 $ 161,583
Computation of income tax [Abstract]        
AB qualifying revenues $ 768,039 $ 711,826 $ 1,540,569 $ 1,412,596
Multiplied by: weighted average equity ownership interest for calculating tax 30.00% 33.60% 27.70% 34.10%
Multiplied by: federal tax 3.50% 3.50% 3.50% 3.50%
Federal income taxes $ 8,059 $ 8,383 $ 14,926 $ 16,869
State income taxes 221 199 371 432
Total income taxes $ 8,280 $ 8,582 $ 15,297 $ 17,301
Effective tax rate (percent) 10.40% 10.90% 8.90% 10.70%
Changes in components for calculation of income tax [Abstract]        
Change in net income attributable to AB Unitholders (percent) 21.30%   27.70%  
Change in equity in net income attributable to AB Unitholders (percent) 1.50%   6.60%  
Change in AB qualifying revenues (percent) 7.90%   9.10%  
Change in income taxes (percent) (3.50%)   (11.60%)  
Variable Interest Entity, Primary Beneficiary        
Computation of equity in net income attributable to AllianceBernstein Unitholders [Abstract]        
Net income attributable to AB Unitholders $ 255,222 $ 210,467 $ 550,707 $ 431,266