Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenues:
Dividend and interest income	$ 34,350	$ 44,515
Investment (losses) gains	(20,538)	11,743
Other revenues	30,180	25,293
Total revenues	1,098,124	1,127,868
Less: Broker-dealer related interest expense	17,517	23,717
Net revenues	1,080,607	1,104,151
Expenses:
Employee compensation and benefits	420,531	452,772
Promotion and servicing:
Amortization of deferred sales commissions	20,161	11,799
Trade execution, marketing, T&E and other	36,513	54,991
General and administrative	147,935	137,910
Contingent payment arrangements	64	2,558
Interest on borrowings	7,138	17,370
Amortization of intangible assets	11,237	11,772
Total expenses	844,238	862,154
Operating income	236,369	241,997
Income taxes	14,675	16,042
Net income	221,694	225,955
Net income of consolidated entities attributable to non-controlling interests	895	8,028
Net income attributable to AB Unitholders	$ 220,799	$ 217,927
Earnings Per Unit [Abstract]
Net income per AB Unit (in dollars per share)	$ 0.75	$ 0.75
Diluted net income per AB Unit (in dollars per share)	$ 0.75	$ 0.75
Investment advisory and services fees
Revenues:
Revenue subject to contracts with customers	$ 855,112	$ 784,405
Bernstein research services
Revenues:
Revenue subject to contracts with customers	0	96,222
Distribution revenues
Revenues:
Revenue subject to contracts with customers	199,020	165,690
Promotion and servicing:
Distribution-related payments	$ 200,659	$ 172,982