Net Income per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
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	$ 345,972	$ 167,404	$ 873,471	$ 537,292
Weighted average limited partnership units outstanding – basic (in shares)	286,196,000	285,360,000	286,752,000	285,584,000
Weighted average limited partnership units outstanding – diluted (in shares)	286,196,000	285,360,000	286,752,000	285,584,000
Basic net income per AB Unit (in dollars per share)	$ 1.20	$ 0.58	$ 3.02	$ 1.86
Diluted net income per AB Unit (in dollars per share)	$ 1.20	$ 0.58	$ 3.02	$ 1.86
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%