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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Income Tax Disclosure [Abstract]        
New York City unincorporated business tax (percent)     4.00%  
Multiplied by: federal tax (percent)     3.50%  
Income Tax Contingency [Line Items]        
Multiplied by: weighted average equity ownership interest (percent) 31.40% 39.40% 35.20% 39.50%
Equity in net income attributable to AB Unitholders $ 81,412 $ 136,374 $ 242,995 $ 345,360
Computation of income tax [Abstract]        
AB qualifying revenues $ 718,822 $ 713,242 $ 2,131,418 $ 2,099,807
Multiplied by: weighted average equity ownership interest for calculating tax (percent) 29.50% 35.70% 32.60% 36.40%
Multiplied by: federal tax (percent) 3.50% 3.50% 3.50% 3.50%
Federal income taxes $ 7,424 $ 8,924 $ 24,293 $ 26,728
State income taxes 237 255 669 692
Total income taxes $ 7,661 $ 9,179 $ 24,962 $ 27,420
Effective tax rate (percent) 9.40% 6.70% 10.30% 7.90%
Changes in components for calculation of income tax [Abstract]        
Change in net income attributable to AB Unitholders (percent) (25.10%)   (20.90%)  
Change in equity in net income attributable to AB Unitholders (percent) (40.30%)   (29.60%)  
Change in AB qualifying revenues (percent) 0.80%   1.50%  
Change in income taxes (percent) (16.50%)   (9.00%)  
Variable Interest Entity, Primary Beneficiary        
Income Tax Contingency [Line Items]        
Net income attributable to AB Unitholders $ 259,263 $ 345,972 $ 690,529 $ 873,471