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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 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%
Equity in net income attributable to AB Unitholders $ 82,753 $ 86,281
Computation of income tax [Abstract]    
AB qualifying revenues $ 700,770 $ 695,980
Multiplied by: weighted average equity ownership interest for calculating tax (percent) 34.60% 36.30%
Multiplied by: federal tax (percent) 3.50% 3.50%
Federal income taxes $ 8,486 $ 8,836
State income taxes 233 223
Total income taxes $ 8,719 $ 9,059
Effective tax rate (percent) 10.50% 10.50%
Changes in components for calculation of income tax [Abstract]    
Change in net income attributable to AB Unitholders (percent) 1.30%  
Change in equity in net income attributable to AB Unitholders (percent) (4.10%)  
Change in AB qualifying revenues (percent) 0.70%  
Change in income taxes (percent) (3.80%)  
Variable Interest Entity, Primary Beneficiary    
Income Tax Contingency [Line Items]    
Net income attributable to AB Unitholders $ 220,799 $ 217,927