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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Earnings Per Share [Abstract]        
Net income attributable to APAM $ 57,574 $ 53,625 $ 117,055 $ 104,378
Less: Allocation to participating securities 5,435 5,100 9,760 9,125
Net income available to common stockholders $ 52,139 $ 48,525 $ 107,295 $ 95,253
Basic weighted average shares outstanding (in shares) 64,960,740 63,503,389 64,640,358 63,368,343
Dilutive effect of nonparticipating share-based awards (in shares) 37,759 16,651 36,515 16,009
Diluted weighted average shares outstanding (in shares) 64,998,499 63,520,040 64,676,873 63,384,352
Earnings per share - Basic (in dollars per share) $ 0.80 $ 0.76 $ 1.66 $ 1.50
Earnings per share - Diluted (in dollars per share) $ 0.80 $ 0.76 $ 1.66 $ 1.50