Net Income Per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Net income - basic	$ 274,165	$ 385,843	$ 279,380
Additional allocation of equity in net income attributable to AB resulting from assumed dilutive effect of compensatory options	2	30	56
Net income - diluted	$ 274,167	$ 385,873	$ 279,436
Weighted average units outstanding - basic (in units)	101,763,000	99,545,000	96,870,000
Dilutive effect of compensatory options (in units)	1,000	11,000	27,000
Weighted average units outstanding - diluted (in units)	101,764,000	99,556,000	96,897,000
Basic net income per unit (in dollars per unit)	$ 2.69	$ 3.88	$ 2.88
Diluted net income per unit (in dollars per unit)	$ 2.69	$ 3.88	$ 2.88
Anti-dilutive options excluded from diluted net income (in units)	0	0	29,056