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Earnings Per Share - Computation of basic and diluted net income per share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share [Abstract]        
Net income attributable to APAM $ 66,830 $ 72,990 $ 195,524 $ 190,045
Less: Allocation to participating securities 5,582 6,176 16,384 16,068
Net income available to common stockholders $ 61,248 $ 66,814 $ 179,140 $ 173,977
Basic weighted average shares outstanding (in shares) 65,666,782 65,123,054 65,562,800 64,802,431
Dilutive effect of nonparticipating share-based awards (in shares) 0 39,844 0 37,625
Diluted weighted average shares outstanding (in shares) 65,666,782 65,162,898 65,562,800 64,840,056
Earnings per share - Basic (in dollars per share) $ 0.93 $ 1.03 $ 2.73 $ 2.68
Earnings per share - Diluted (in dollars per share) $ 0.93 $ 1.03 $ 2.73 $ 2.68