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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
Mar. 31, 2022
Mar. 31, 2021
Earnings Per Share [Abstract]    
Net income attributable to APAM $ 65,433 $ 77,278
Less: Allocation to participating securities 9,431 7,139
Net income available to common stockholders $ 56,002 $ 70,139
Basic weighted average shares outstanding (in shares) 62,039,038 58,758,284
Dilutive effect of nonparticipating share-based awards (in shares) 31,322 14,985
Diluted weighted average shares outstanding (in shares) 62,070,360 58,773,269
Earnings per share - Basic (in dollars per share) $ 0.90 $ 1.19
Earnings per share - Diluted (in dollars per share) $ 0.90 $ 1.19