Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Revenues:
Dividend and interest income	$ 29,201	$ 36,137	$ 59,671	$ 70,487
Investment gains (losses)	13,505	(7,825)	44,564	(28,363)
Other revenues	32,945	33,912	68,115	64,092
Total revenues	1,183,516	1,104,569	2,398,247	2,202,693
Less: Broker-dealer related interest expense	12,512	15,662	25,517	33,179
Net revenues	1,171,004	1,088,907	2,372,730	2,169,514
Expenses:
Employee compensation and benefits	471,127	439,554	938,684	860,085
Promotion and servicing:
Amortization of deferred sales commissions	21,156	21,150	42,651	41,311
Trade execution, marketing, T&E and other	42,082	40,819	82,599	77,332
General and administrative	135,133	148,018	265,524	295,953
Interest on borrowings	7,099	8,463	14,306	15,601
Amortization of intangible assets	11,181	11,288	22,344	22,589
Total expenses	881,852	866,813	1,756,778	1,711,051
Operating income	289,152	222,094	615,952	458,463
Income taxes	16,782	14,806	34,946	29,481
Net income	272,370	207,288	581,006	428,982
Net income (loss) of consolidated entities attributable to non-controlling interests	17,148	(3,179)	30,299	(2,284)
Net income attributable to AB Unitholders	$ 255,222	$ 210,467	$ 550,707	$ 431,266
Earnings Per Unit [Abstract]
Net income per AB Unit - basic (in dollars per share)	$ 0.86	$ 0.71	$ 1.85	$ 1.46
Net income per AB Unit - diluted (in dollars per share)	$ 0.86	$ 0.71	$ 1.85	$ 1.46
Investment advisory and services fees
Revenues:
Revenue subject to contracts with customers	$ 906,946	$ 843,978	$ 1,822,160	$ 1,699,090
Distribution revenues
Revenues:
Revenue subject to contracts with customers	200,919	198,367	403,737	397,387
Promotion and servicing:
Distribution-related payments	$ 194,074	$ 197,521	$ 390,670	$ 398,180