Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues:
Revenue subject to contracts with customers	$ 832,568	$ 763,325	$ 1,653,728	$ 1,492,826
Dividend and interest income	21,194	19,348	49,409	33,404
Investment gains (losses)	213	24,113	26,295	49,314
Other revenues	27,264	24,265	54,292	46,630
Total revenues	856,870	808,508	1,734,197	1,577,715
Less: Interest expense	12,132	6,195	21,672	10,485
Net revenues	844,738	802,313	1,712,525	1,567,230
Expenses:
Employee compensation and benefits	358,248	327,862	702,073	649,610
Promotion and servicing:
Distribution-related payments	106,301	100,632	216,455	194,845
Amortization of deferred sales commissions	6,113	8,307	12,711	17,386
Trade execution, marketing, T&E and other	59,259	55,359	113,302	105,727
General and administrative:
General and administrative	108,836	117,462	230,070	231,683
Real estate charges	6,909	20,747	6,645	20,745
Contingent payment arrangements	52	178	105	355
Interest on borrowings	2,629	2,254	5,241	4,122
Amortization of intangible assets	6,927	6,975	13,788	13,908
Total expenses	655,274	639,776	1,300,390	1,238,381
Operating income	189,464	162,537	412,135	328,849
Income taxes	7,538	10,265	23,363	20,322
Net income	181,926	152,272	388,772	308,527
Net income of consolidated entities attributable to non-controlling interests	261	17,169	22,911	33,487
Net income attributable to AB Unitholders	$ 181,665	$ 135,103	$ 365,861	$ 275,040
Net income per AB Unit:
Basic (in dollars per unit)	$ 0.66	$ 0.50	$ 1.34	$ 1.01
Diluted (in dollars per unit)	$ 0.66	$ 0.50	$ 1.34	$ 1.01
Investment advisory and services fees
Revenues:
Revenue subject to contracts with customers	$ 596,870	$ 531,163	$ 1,170,468	$ 1,029,453
Bernstein research services
Revenues:
Revenue subject to contracts with customers	106,211	109,470	220,611	222,211
Distribution revenues
Revenues:
Revenue subject to contracts with customers	$ 105,118	$ 100,149	$ 213,122	$ 196,703