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Earnings Per Share - Computation of basic and diluted net income (loss) per share (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Earnings Per Share [Abstract]      
Net income attributable to APAM $ 222,289 $ 206,755 $ 336,516
Less allocation to participating securities 19,880 22,801 31,430
Net income (loss) available to common stockholders $ 202,409 $ 183,954 $ 305,086
Basic weighted average shares outstanding 63,451,932 62,475,960 59,866,790
Dilutive effect of nonparticipating equity awards 34,547 22,549 14,249
Diluted weighted average number of common shares outstanding 63,486,479 62,498,509 59,881,039
Earnings per share - Basic $ 3.19 $ 2.94 $ 5.10
Earnings per share - Diluted $ 3.19 $ 2.94 $ 5.09