Consolidated Company-Sponsored Investment Funds - Summary of Balance Sheet Amounts (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Condensed Balance Sheet Statements, Captions [Line Items]
Total assets	$ 9,796,380	$ 9,609,806
Liabilities	5,253,803	4,947,024
Redeemable non-controlling interest	124,894	209,420
Partners' capital attributable to AB Unitholders	4,417,683	4,453,362	$ 4,443,358
Total liabilities, redeemable non-controlling interest and partners' capital	9,796,380	9,609,806
Company-Sponsored Investment Funds
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	7,536	7,739
Investments	298,128	397,174
Other assets	10,953	25,299
Total assets	316,617	430,212
Liabilities	14,132	12,537
Redeemable non-controlling interest	124,894	209,420
Partners' capital attributable to AB Unitholders	177,591	208,255
Total liabilities, redeemable non-controlling interest and partners' capital	316,617	430,212
VIEs
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	7,425	7,572
Investments	171,088	286,619
Other assets	9,251	15,010
Total assets	187,764	309,201
Liabilities	10,002	9,699
Redeemable non-controlling interest	103,743	202,882
Partners' capital attributable to AB Unitholders	74,019	96,620
Total liabilities, redeemable non-controlling interest and partners' capital	187,764	309,201
VOEs
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	111	167
Investments	127,040	110,555
Other assets	1,702	10,289
Total assets	128,853	121,011
Liabilities	4,130	2,838
Redeemable non-controlling interest	21,151	6,538
Partners' capital attributable to AB Unitholders	103,572	111,635
Total liabilities, redeemable non-controlling interest and partners' capital	$ 128,853	$ 121,011