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Net Income Per Unit (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Earnings Per Share [Abstract]      
Net income - basic $ 423,374 $ 264,184 $ 274,165
Additional allocation of equity in net income attributable to AB resulting from assumed dilutive effect of compensatory options 0 0 2
Net income - diluted $ 423,374 $ 264,184 $ 274,167
Weighted average units outstanding - basic (in shares) 114,125,000 112,948,000 101,763,000
Dilutive effect of compensatory options (in shares) 0 0 1,000
Weighted average units outstanding - diluted (in shares) 114,125,000 112,948,000 101,764,000
Basic net income per unit (in dollars per unit) $ 3.71 $ 2.34 $ 2.69
Diluted net income per unit (in dollars per unit) $ 3.71 $ 2.34 $ 2.69
Anti-dilutive options excluded from diluted net income (in shares) 0 0 0