Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues:
Revenue subject to contracts with customers	$ 1,064,133	$ 837,395	$ 2,061,598	$ 1,744,715
Dividend and interest income	8,658	12,692	17,342	33,157
Investment gains (losses)	4,181	24,189	6,109	(20,117)
Other revenues	25,900	26,092	53,611	51,603
Total revenues	1,077,556	874,884	2,085,966	1,758,359
Less: Interest expense	734	3,435	1,878	12,754
Net revenues	1,076,822	871,449	2,084,088	1,745,605
Expenses:
Employee compensation and benefits	435,707	349,638	841,766	711,910
Promotion and servicing:
Amortization of deferred sales commissions	8,236	6,622	16,135	12,148
Trade execution, marketing, T&E and other	46,571	44,288	93,249	99,898
General and administrative:
General and administrative	131,324	121,424	251,547	243,691
Real estate charges	0	5,526	0	5,526
Contingent payment arrangements	838	807	1,634	1,600
Interest on borrowings	1,241	1,096	2,535	3,930
Amortization of intangible assets	1,521	6,723	3,000	13,209
Total expenses	793,199	661,802	1,539,881	1,357,735
Operating income	283,623	209,647	544,207	387,870
Income taxes	12,480	11,386	29,225	20,860
Net income	271,143	198,261	514,982	367,010
Net income (loss) of consolidated entities attributable to non-controlling interests	3,573	20,940	3,281	(4,631)
Net income attributable to AB Unitholders	$ 267,570	$ 177,321	$ 511,701	$ 371,641
Net income per AB Unit:
Basic (in dollars per unit)	$ 0.97	$ 0.65	$ 1.86	$ 1.36
Diluted (in dollars per unit)	$ 0.97	$ 0.65	$ 1.86	$ 1.36
Investment advisory and services fees
Revenues:
Revenue subject to contracts with customers	$ 777,624	$ 578,203	$ 1,481,090	$ 1,199,928
Bernstein research services
Revenues:
Revenue subject to contracts with customers	105,655	113,609	224,676	242,832
Distribution related
Revenues:
Revenue subject to contracts with customers	155,538	120,099	303,138	250,956
Promotion and servicing:
Distribution-related payments	$ 167,761	$ 125,678	$ 330,015	$ 265,823