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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Share [Abstract]        
Net income attributable to APAM $ 53,155 $ 44,235 $ 157,533 $ 153,947
Less: Allocation to participating securities 4,691 3,651 13,799 18,675
Net income available to common stockholders $ 48,464 $ 40,584 $ 143,734 $ 135,272
Basic weighted average shares outstanding (in shares) 63,520,402 62,623,434 63,419,587 62,329,756
Dilutive effect of nonparticipating share-based awards (in shares) 42,642 9,226 30,217 23,519
Diluted weighted average shares outstanding (in shares) 63,563,044 62,632,660 63,449,804 62,353,275
Earnings per share - Basic (in dollars per share) $ 0.76 $ 0.65 $ 2.27 $ 2.17
Earnings per share - Diluted (in dollars per share) $ 0.76 $ 0.65 $ 2.27 $ 2.17