Consolidated Company-Sponsored Investment Funds - Summary of Balance Sheet Amounts (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022
Condensed Balance Sheet Statements, Captions [Line Items]
Total assets	$ 9,916,436	$ 11,138,931
Liabilities	5,313,911	6,292,635
Redeemable non-controlling interest	185,563	368,656
Partners' capital attributable to AB Unitholders	4,416,962	4,477,640	$ 3,859,283
Total liabilities, redeemable non-controlling interest and capital	9,916,436	11,138,931
Company-sponsored investment funds
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	14,684	19,751
Investments	321,927	516,536
Other assets	10,578	44,424
Total assets	347,189	580,711
Liabilities	10,605	55,529
Redeemable non-controlling interest	185,563	368,656
Partners' capital attributable to AB Unitholders	151,021	156,526
Total liabilities, redeemable non-controlling interest and capital	347,189	580,711
VIEs
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	14,684	19,751
Investments	306,500	516,536
Other assets	9,704	44,424
Total assets	330,888	580,711
Liabilities	9,712	55,529
Redeemable non-controlling interest	181,163	368,656
Partners' capital attributable to AB Unitholders	140,013	156,526
Total liabilities, redeemable non-controlling interest and capital	330,888	580,711
VOEs
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	0	0
Investments	15,427	0
Other assets	874	0
Total assets	16,301	0
Liabilities	893	0
Redeemable non-controlling interest	4,400	0
Partners' capital attributable to AB Unitholders	11,008	0
Total liabilities, redeemable non-controlling interest and capital	$ 16,301	$ 0