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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Earnings Per Share [Abstract]      
Net income attributable to APAM $ 259,748 $ 222,289 $ 206,755
Less allocation to participating securities 22,303 19,880 22,801
Net income (loss) available to common stockholders $ 237,445 $ 202,409 $ 183,954
Basic weighted average shares outstanding 64,900,228 63,451,932 62,475,960
Dilutive effect of nonparticipating equity awards 38,955 34,547 22,549
Diluted weighted average number of common shares outstanding 64,939,183 63,486,479 62,498,509
Earnings per share - Basic $ 3.66 $ 3.19 $ 2.94
Earnings per share - Diluted $ 3.66 $ 3.19 $ 2.94