Consolidated Company-Sponsored Investment Funds - Summary of Balance Sheet Amounts (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Total assets	$ 9,609,806	$ 11,138,931
Liabilities	4,947,024	6,292,635
Redeemable non-controlling interest of consolidated entities	209,420	368,656
Partners' capital attributable to AB Unitholders	4,453,362	4,477,640	$ 4,160,923
Total liabilities, non-controlling interest and capital	9,609,806	11,138,931
Company-sponsored investment funds
Variable Interest Entity [Line Items]
Cash and cash equivalents	7,739	19,751
Investments	397,174	516,536
Other assets	25,299	44,424
Total assets	430,212	580,711
Liabilities	12,537	55,529
Redeemable non-controlling interest of consolidated entities	209,420	368,656
Partners' capital attributable to AB Unitholders	208,255	156,526
Total liabilities, non-controlling interest and capital	430,212	580,711
VIEs
Variable Interest Entity [Line Items]
Cash and cash equivalents	7,572	19,751
Investments	286,619	516,536
Other assets	15,010	44,424
Total assets	309,201	580,711
Liabilities	9,699	55,529
Redeemable non-controlling interest of consolidated entities	202,882	368,656
Partners' capital attributable to AB Unitholders	96,620	156,526
Total liabilities, non-controlling interest and capital	309,201	580,711
VOEs
Variable Interest Entity [Line Items]
Cash and cash equivalents	167	0
Investments	110,555	0
Other assets	10,289	0
Total assets	121,011	0
Liabilities	2,838	0
Redeemable non-controlling interest of consolidated entities	6,538	0
Partners' capital attributable to AB Unitholders	111,635	0
Total liabilities, non-controlling interest and capital	$ 121,011	$ 0