Consolidated Company-Sponsored Investment Funds - Summary of Balance Sheet Amounts (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Total assets	$ 9,071,927	$ 9,609,806
Liabilities	4,148,795	4,947,024
Redeemable non-controlling interest	48,489	209,420
Partners' capital attributable to AB Unitholders	4,874,643	4,453,362	$ 4,477,640
Total liabilities, non-controlling interest and capital	9,071,927	9,609,806
Company-sponsored investment funds
Variable Interest Entity [Line Items]
Cash and cash equivalents	1,989	7,739
Investments	140,792	397,174
Other assets	14,801	25,299
Total assets	157,582	430,212
Liabilities	1,716	12,537
Redeemable non-controlling interest	48,489	209,420
Partners' capital attributable to AB Unitholders	107,377	208,255
Total liabilities, non-controlling interest and capital	157,582	430,212
VIEs
Variable Interest Entity [Line Items]
Cash and cash equivalents	1,671	7,572
Investments	82,027	286,619
Other assets	1,317	15,010
Total assets	85,015	309,201
Liabilities	345	9,699
Redeemable non-controlling interest	31,670	202,882
Partners' capital attributable to AB Unitholders	53,000	96,620
Total liabilities, non-controlling interest and capital	85,015	309,201
VOEs
Variable Interest Entity [Line Items]
Cash and cash equivalents	318	167
Investments	58,765	110,555
Other assets	13,484	10,289
Total assets	72,567	121,011
Liabilities	1,371	2,838
Redeemable non-controlling interest	16,819	6,538
Partners' capital attributable to AB Unitholders	54,377	111,635
Total liabilities, non-controlling interest and capital	$ 72,567	$ 121,011