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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

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