Net Income per Unit (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Limited partners interest in company (percent)			99.00%
Net income per unit, basic and diluted [Abstract]
Net income attributable to AB Unitholders	$ 210,467	$ 309,572	$ 431,266	$ 527,499
Weighted average limited partnership Units outstanding – basic (in shares)	292,064	287,192	292,125	287,034
Weighted average limited partnership Units outstanding – diluted (in shares)	292,064	287,192	292,125	287,034
Basic net income per AB Unit (in dollars per share)	$ 0.71	$ 1.07	$ 1.46	$ 1.82
Diluted net income per AB Unit (in dollars per share)	$ 0.71	$ 1.07	$ 1.46	$ 1.82
AB Holding | AB Corporation
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
General partnership interest in company (percent)			1.00%