v3.26.3
Net Income per Unit - Summary of Earnings Per Unit, Basic and Diluted (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Earnings Per Unit [Abstract]        
Net income attributable to AB Unitholders $ 256,904 $ 259,263 $ 807,611 $ 690,529
Weighted average limited partnership Units outstanding – basic (in shares) 293,888 292,116 294,048 292,122
Weighted average limited partnership Units outstanding – diluted (in shares) 293,888 292,116 294,048 292,122
Net income per AB Unit - basic (in dollars per share) $ 0.87 $ 0.88 $ 2.72 $ 2.34
Net income per AB Unit - diluted (in dollars per share) $ 0.87 $ 0.88 $ 2.72 $ 2.34