Net Income per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Unit [Abstract]
Net income – basic	$ 60,558	$ 68,141	$ 127,995	$ 154,069
Additional allocation of equity in net income attributable to AB resulting from assumed dilutive effect of compensatory options	0	0	0	2
Net income – diluted	$ 60,558	$ 68,141	$ 127,995	$ 154,071
Weighted average units outstanding – basic (in shares)	113,494,000	98,802,000	113,520,000	99,001,000
Dilutive effect of compensatory options (in shares)	0	0	0	2,000
Weighted average units outstanding – diluted (in shares)	113,494,000	98,802,000	113,520,000	99,003,000
Basic net income per unit (in dollars per share)	$ 0.53	$ 0.69	$ 1.13	$ 1.56
Diluted net income per unit (in dollars per share)	$ 0.53	$ 0.69	$ 1.13	$ 1.56
Anti-dilutive units excluded from diluted net income (in shares)	0	0	0	0