Consolidated Company-Sponsored Investment Funds - Summary of Balance Sheet Amounts (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Condensed Balance Sheet Statements, Captions [Line Items]
Total assets	$ 10,390,865	$ 11,138,931
Liabilities	5,571,217	6,292,635
Redeemable non-controlling interest	376,290	368,656
Partners' capital attributable to AB Unitholders	4,443,358	4,477,640	$ 4,036,699
Total liabilities, redeemable non-controlling interest and capital	10,390,865	11,138,931
Company-sponsored investment funds
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	20,417	19,751
Investments	543,339	516,536
Other assets	30,795	44,424
Total assets	594,551	580,711
Liabilities	43,647	55,529
Redeemable non-controlling interest	376,290	368,656
Partners' capital attributable to AB Unitholders	174,614	156,526
Total liabilities, redeemable non-controlling interest and capital	594,551	580,711
VIEs
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	20,417	19,751
Investments	526,530	516,536
Other assets	30,556	44,424
Total assets	577,503	580,711
Liabilities	43,586	55,529
Redeemable non-controlling interest	374,736	368,656
Partners' capital attributable to AB Unitholders	159,181	156,526
Total liabilities, redeemable non-controlling interest and capital	577,503	580,711
VOEs
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	0	0
Investments	16,809	0
Other assets	239	0
Total assets	17,048	0
Liabilities	61	0
Redeemable non-controlling interest	1,554	0
Partners' capital attributable to AB Unitholders	15,433	0
Total liabilities, redeemable non-controlling interest and capital	$ 17,048	$ 0