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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]        
Net income attributable to APAM $ 86,413 $ 58,527 $ 251,898 $ 139,503
Less: Allocation to participating securities 8,226 6,006 23,260 16,944
Net income available to common stockholders $ 78,187 $ 52,521 $ 228,638 $ 122,559
Basic weighted average shares outstanding (in shares) 59,965,549 56,402,503 59,519,634 55,188,563
Dilutive effect of nonparticipating share-based awards (in shares) 17,225 5,769 16,260 1,923
Diluted weighted average shares outstanding (in shares) 59,982,774 56,408,272 59,535,894 55,190,486
Earnings per share - Basic (in dollars per share) $ 1.30 $ 0.93 $ 3.84 $ 2.22
Earnings per share - Diluted (in dollars per share) $ 1.30 $ 0.93 $ 3.84 $ 2.22