Net Income per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Limited Partners interest in Company (as a percent)			99.00%
Net income per unit, basic and diluted [Abstract]
Net income attributable to AB Unitholders	$ 167,404	$ 175,180	$ 537,292	$ 644,676
Weighted average limited partnership units outstanding – basic (in shares)	285,360,000	272,646,000	285,584,000	271,675,000
Dilutive effect of compensatory options to buy AB Holding Units (in shares)	0	0	0	2,000
Weighted average limited partnership units outstanding – diluted (in shares)	285,360,000	272,646,000	285,584,000	271,677,000
Basic net income per AB Unit (in dollars per share)	$ 0.58	$ 0.64	$ 1.86	$ 2.35
Diluted net income per AB Unit (in dollars per share)	$ 0.58	$ 0.64	$ 1.86	$ 2.35
Anti-dilutive options excluded from diluted net income (in shares)	0	0	0	0
AB Holding | AB
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
General partnership interest in Company (percent)			1.00%