Net Income per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Earnings Per Unit [Abstract]
Net income – basic	$ 67,437	$ 85,928
Additional allocation of equity in net income attributable to AB resulting from assumed dilutive effect of compensatory options	0	2
Net income – diluted	$ 67,437	$ 85,930
Weighted average units outstanding – basic (in shares)	113,547,000	99,202,000
Dilutive effect of compensatory options (in shares)	0	3,000
Weighted average units outstanding – diluted (in shares)	113,547,000	99,205,000
Basic net income per unit (in dollars per share)	$ 0.59	$ 0.87
Diluted net income per unit (in dollars per share)	$ 0.59	$ 0.87
Anti-dilutive units excluded from diluted net income (in shares)	0	0