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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, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Earnings Per Share [Abstract]        
Net income attributable to APAM $ 53,625 $ 44,279 $ 104,378 $ 109,712
Less: Allocation to participating securities 5,100 5,903 9,125 15,265
Net income available to common stockholders $ 48,525 $ 38,376 $ 95,253 $ 94,447
Basic weighted average shares outstanding (in shares) 63,503,389 62,320,372 63,368,343 62,180,483
Dilutive effect of nonparticipating share-based awards (in shares) 16,651 30,011 16,009 30,665
Diluted weighted average shares outstanding (in shares) 63,520,040 62,350,383 63,384,352 62,211,148
Earnings per share - Basic (in dollars per share) $ 0.76 $ 0.62 $ 1.50 $ 1.52
Earnings per share - Diluted (in dollars per share) $ 0.76 $ 0.62 $ 1.50 $ 1.52