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Net Income Per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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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

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