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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, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Earnings Per Share [Abstract]        
Net income attributable to APAM $ 67,555 $ 57,574 $ 128,694 $ 117,055
Less: Allocation to participating securities 5,974 5,435 11,886 9,760
Net income available to common stockholders $ 61,581 $ 52,139 $ 116,808 $ 107,295
Basic weighted average shares outstanding (in shares) 65,645,108 64,960,740 65,509,947 64,640,358
Dilutive effect of nonparticipating share-based awards (in shares) 0 37,759 0 36,515
Diluted weighted average shares outstanding (in shares) 65,645,108 64,998,499 65,509,947 64,676,873
Earnings per share - Basic (in dollars per share) $ 0.94 $ 0.80 $ 1.78 $ 1.66
Earnings per share - Diluted (in dollars per share) $ 0.94 $ 0.80 $ 1.78 $ 1.66