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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Earnings Per Share [Abstract]        
Net income attributable to APAM $ 44,235 $ 86,413 $ 153,947 $ 251,898
Less: Allocation to participating securities 3,651 8,226 18,675 23,260
Net income available to common stockholders $ 40,584 $ 78,187 $ 135,272 $ 228,638
Basic weighted average shares outstanding (in shares) 62,623,434 59,965,549 62,329,756 59,519,634
Dilutive effect of nonparticipating share-based awards (in shares) 9,226 17,225 23,519 16,260
Diluted weighted average shares outstanding (in shares) 62,632,660 59,982,774 62,353,275 59,535,894
Earnings per share - Basic (in dollars per share) $ 0.65 $ 1.30 $ 2.17 $ 3.84
Earnings per share - Diluted (in dollars per share) $ 0.65 $ 1.30 $ 2.17 $ 3.84