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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 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) 37.50% 39.60% 37.50% 39.60%
Equity in net income attributable to AB Unitholders $ 78,830 $ 122,705 $ 161,583 $ 208,986
Computation of income tax [Abstract]        
AB qualifying revenues $ 711,826 $ 690,585 $ 1,412,596 $ 1,386,565
Multiplied by: weighted average equity ownership interest for calculating tax (percent) 33.60% 37.10% 34.10% 36.70%
Multiplied by: federal tax (percent) 3.50% 3.50% 3.50% 3.50%
Federal income taxes $ 8,383 $ 8,968 $ 16,869 $ 17,804
State income taxes 199 214 432 437
Total income taxes $ 8,582 $ 9,182 $ 17,301 $ 18,241
Effective tax rate (percent) 10.90% 7.50% 10.70% 8.70%
Changes in components for calculation of income tax [Abstract]        
Change in net income attributable to AB Unitholders (percent) (32.00%)   (18.20%)  
Change in equity in net income attributable to AB Unitholders (percent) (35.80%)   (22.70%)  
Change in AB qualifying revenues (percent) 3.10%   1.90%  
Change in income taxes (percent) (6.50%)   (5.20%)  
Variable Interest Entity, Primary Beneficiary        
Income Tax Contingency [Line Items]        
Net income attributable to AB Unitholders $ 210,467 $ 309,572 $ 431,266 $ 527,499