Income Taxes - Summary of Income Taxes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Computation of equity in net income attributable to AB Unitholders [Abstract]
Multiplied by: weighted average equity ownership interest	36.70%	36.20%	35.60%
Equity in net income attributable to AB Unitholders	$ 305,504,000	$ 416,326,000	$ 308,404,000
Computation of income tax [Abstract]
AB qualifying revenues	$ 2,775,693,000	$ 2,779,281,000	$ 2,740,137,000
Multiplied by: weighted average equity ownership interest for calculating tax	31.60%	30.50%	30.10%
Multiplied by: federal tax	3.50%	3.50%	3.50%
Federal income taxes	$ 30,676,000	$ 29,643,000	$ 28,522,000
State income taxes	663,000	840,000	502,000
Total income taxes	$ 31,339,000	$ 30,483,000	29,024,000
Changes in components for calculation of income tax [Abstract]
Increase in net income attributable to AB Unitholders (percent)	(27.60%)	32.60%
Increase in equity in net income attributable to AB Unitholders (percent)	(26.60%)	35.00%
Increase (decrease) in AB qualifying revenue (percent)	(0.10%)	1.40%
Increase (decrease) in income taxes (percent)	2.80%	5.00%
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	$ 831,813,000	$ 1,148,623,000	$ 865,952,000