Consolidated Company-Sponsored Investment Funds - Summary of Balance Sheet Amounts (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023
Condensed Balance Sheet Statements, Captions [Line Items]
Total assets	$ 9,100,970	$ 9,609,806
Liabilities	4,508,018	4,947,024
Redeemable non-controlling interest	108,255	209,420
Partners' capital attributable to AB Unitholders	4,484,697	4,453,362	$ 4,416,962
Total liabilities, redeemable non-controlling interest and partners' capital	9,100,970	9,609,806
Company-Sponsored Investment Funds
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	3,857	7,739
Investments	253,070	397,174
Other assets	3,676	25,299
Total assets	260,603	430,212
Liabilities	1,453	12,537
Redeemable non-controlling interest	108,255	209,420
Partners' capital attributable to AB Unitholders	150,895	208,255
Total liabilities, redeemable non-controlling interest and partners' capital	260,603	430,212
VIEs
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	3,733	7,572
Investments	157,618	286,619
Other assets	2,544	15,010
Total assets	163,895	309,201
Liabilities	1,142	9,699
Redeemable non-controlling interest	92,498	202,882
Partners' capital attributable to AB Unitholders	70,255	96,620
Total liabilities, redeemable non-controlling interest and partners' capital	163,895	309,201
VOEs
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	124	167
Investments	95,452	110,555
Other assets	1,132	10,289
Total assets	96,708	121,011
Liabilities	311	2,838
Redeemable non-controlling interest	15,757	6,538
Partners' capital attributable to AB Unitholders	80,640	111,635
Total liabilities, redeemable non-controlling interest and partners' capital	$ 96,708	$ 121,011