Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues:
Revenue subject to contracts with customers	$ 841,442	$ 781,519	$ 2,497,449	$ 2,274,467
Dividend and interest income	21,942	17,619	71,351	51,023
Investment gains (losses)	565	18,808	26,860	68,122
Other revenues	24,012	24,902	76,548	71,532
Total revenues	864,651	818,863	2,598,848	2,396,578
Less: Interest expense	14,475	6,713	36,147	17,198
Net revenues	850,176	812,150	2,562,701	2,379,380
Expenses:
Employee compensation and benefits	357,442	329,777	1,059,515	979,387
Promotion and servicing:
Distribution-related payments	106,372	106,106	322,827	300,951
Amortization of deferred sales commissions	4,651	7,629	17,362	25,015
Trade execution, marketing, T&E and other	50,793	50,266	164,095	155,993
General and administrative:
General and administrative	107,526	128,712	337,596	360,395
Real estate (credit) charges	(155)	18,655	6,490	39,400
Contingent payment arrangements	52	(140)	157	215
Interest on borrowings	2,711	2,105	7,952	6,227
Amortization of intangible assets	6,965	7,013	20,753	20,921
Total expenses	636,357	650,123	1,936,747	1,888,504
Operating income	213,819	162,027	625,954	490,876
Income taxes	9,419	4,547	32,782	24,869
Net income	204,400	157,480	593,172	466,007
Net income of consolidated entities attributable to non-controlling interests	726	16,526	23,637	50,013
Net income attributable to AB Unitholders	$ 203,674	$ 140,954	$ 569,535	$ 415,994
Net income per AB Unit:
Basic (in dollars per unit)	$ 0.75	$ 0.53	$ 2.09	$ 1.54
Diluted (in dollars per unit)	$ 0.75	$ 0.52	$ 2.09	$ 1.54
Investment advisory and services fees
Revenues:
Revenue subject to contracts with customers	$ 610,063	$ 543,107	$ 1,782,287	$ 1,572,560
Bernstein research services
Revenues:
Revenue subject to contracts with customers	103,581	108,385	324,192	330,596
Distribution revenues
Revenues:
Revenue subject to contracts with customers	$ 104,488	$ 106,042	$ 317,610	$ 302,745