Consolidated Company-Sponsored Investment Funds - Summary of Balance Sheet Amounts (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Condensed Balance Sheet Statements, Captions [Line Items]
Other assets	$ 357,670	$ 262,303
Total assets	10,891,108	10,510,088
Liabilities	6,635,568	5,927,996
Redeemable non-controlling interest	311,893	421,169
Partners' capital attributable to AB Unitholders	3,932,439	4,160,923	$ 3,991,400
Total liabilities, redeemable non-controlling interest and capital	10,891,108	10,510,088
VIEs
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	21,123	90,326
Investments	445,575	613,025
Other assets	10,717	30,461
Total assets	477,415	733,812
Liabilities	25,769	87,000
Redeemable non-controlling interest	309,941	421,169
Partners' capital attributable to AB Unitholders	141,705	225,643
Total liabilities, redeemable non-controlling interest and capital	477,415	733,812
VOEs
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	8	0
Investments	26,045	0
Other assets	1,572	0
Total assets	27,625	0
Liabilities	1,763	0
Redeemable non-controlling interest	1,952	0
Partners' capital attributable to AB Unitholders	23,910	0
Total liabilities, redeemable non-controlling interest and capital	27,625	0
Company-sponsored investment funds
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	21,131	90,326
Investments	471,620	613,025
Other assets	12,289	30,461
Total assets	505,040	733,812
Liabilities	27,532	87,000
Redeemable non-controlling interest	311,893	421,169
Partners' capital attributable to AB Unitholders	165,615	225,643
Total liabilities, redeemable non-controlling interest and capital	$ 505,040	$ 733,812