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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, 2021
Mar. 31, 2020
Earnings Per Share [Abstract]    
Net income attributable to APAM $ 77,278 $ 34,825
Less: Allocation to participating securities 7,139 6,835
Net income available to common stockholders $ 70,139 $ 27,990
Basic weighted average number of common shares outstanding 58,758,284 53,265,479
Weighted Average Number Diluted Shares Outstanding Adjustment 14,985 0
Diluted weighted average number of common shares outstanding 58,773,269 53,265,479
Earnings per share - Basic (in dollars per share) $ 1.19 $ 0.53
Earnings per share - Diluted (in dollars per share) $ 1.19 $ 0.53