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Income Taxes - Summary of Income Taxes (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Computation of equity in net income attributable to AB Unitholders [Abstract]      
Multiplied by: weighted average equity ownership interest (percent) 39.40% 39.20% 36.70%
Equity in net income attributable to AB Unitholders $ 461,949,000 $ 299,781,000 $ 305,504,000
Computation of income tax [Abstract]      
AB qualifying revenues $ 2,964,983,000 $ 2,790,628,000 $ 2,775,693,000
Multiplied by: weighted average equity ownership interest for calculating tax (percent) 36.30% 35.60% 31.60%
Multiplied by: federal tax (percent) 3.50% 3.50% 3.50%
Federal income taxes $ 37,622,000 $ 34,765,000 $ 30,676,000
State income taxes 953,000 832,000 663,000
Total income taxes $ 38,575,000 $ 35,597,000 31,339,000
Changes in components for calculation of income tax [Abstract]      
Change in net income attributable to AB Unitholders (percent) 53.40% (8.10%)  
Change in equity in net income attributable to AB Unitholders (percent) 54.10% (1.90%)  
Change in AB qualifying revenues (percent) 6.20% (0.50%)  
Change in income taxes (percent) 8.40% 13.60%  
Unrecognized tax benefits $ 0 $ 0  
Variable Interest Entity, Primary Beneficiary      
Computation of equity in net income attributable to AB Unitholders [Abstract]      
Net income attributable to AB Unitholders $ 1,173,247,000 $ 764,610,000 $ 831,813,000