Consolidated Company-Sponsored Investment Funds - Summary of Balance Sheet Amounts (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Condensed Balance Sheet Statements, Captions [Line Items]
Other assets	$ 353,802	$ 262,303
Total assets	10,496,916	10,510,088
Liabilities	6,328,680	5,927,996
Redeemable non-controlling interest	308,953	421,169
Partners' capital attributable to AB Unitholders	3,859,283	4,160,923	$ 4,042,220
Total liabilities, redeemable non-controlling interest and capital	10,496,916	10,510,088
VIEs
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	15,598	90,326
Investments	458,505	613,025
Other assets	23,282	30,461
Total assets	497,385	733,812
Liabilities	37,780	87,000
Redeemable non-controlling interest	308,953	421,169
Partners' capital attributable to AB Unitholders	150,652	225,643
Total liabilities, redeemable non-controlling interest and capital	$ 497,385	$ 733,812