Consolidated Company-Sponsored Investment Funds - Summary of Balance Sheet Amounts (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Condensed Balance Sheet Statements, Captions [Line Items]
Other assets	$ 373,718	$ 262,303
Total assets	10,535,406	10,510,088
Liabilities	6,160,686	5,927,996
Redeemable non-controlling interest	338,021	421,169
Partners' capital attributable to AB Unitholders	4,036,699	4,160,923	$ 4,049,162
Total liabilities, redeemable non-controlling interest and capital	10,535,406	10,510,088
Company-sponsored investment funds
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	24,145	90,326
Investments	486,926	613,025
Other assets	30,594	30,461
VIEs
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	24,145	90,326
Investments	486,926	613,025
Other assets	30,594	30,461
Total assets	541,665	733,812
Liabilities	36,774	87,000
Redeemable non-controlling interest	338,021	421,169
Partners' capital attributable to AB Unitholders	166,870	225,643
Total liabilities, redeemable non-controlling interest and capital	$ 541,665	$ 733,812