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Income Taxes - Principal Reasons for the Difference Between the Effective Tax Rate and Statutory Tax Rate (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]      
New York City unincorporated business tax rate 4.00% 4.00% 4.00%
Multiplied by: federal tax (percent) 3.50% 3.50% 3.50%
AB Holding's effective tax expense [Abstract]      
UBT statutory rate $ 18,478 $ 11,991 $ 12,220
Federal tax on partnership gross business income 37,622 34,765 30,676
State income taxes 953 832 663
Credit for UBT paid by AB (18,478) (11,991) (12,220)
Total income taxes $ 38,575 $ 35,597 $ 31,339
AB Holding' effective tax rate [Abstract]      
UBT statutory rate 4.00% 4.00% 4.00%
Federal tax on partnership gross business income 8.10% 11.60% 10.00%
State income taxes 0.30% 0.30% 0.20%
Credit for UBT paid by AB (4.00%) (4.00%) (4.00%)
Income tax expense and effective tax rate 8.40% 11.90% 10.30%