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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, 2025
Mar. 31, 2024
Earnings Per Share [Abstract]    
Net income attributable to APAM $ 61,139 $ 59,481
Less: Allocation to participating securities 7,297 5,464
Net income available to common stockholders $ 53,842 $ 54,017
Basic weighted average shares outstanding (in shares) 65,373,285 64,319,977
Dilutive effect of nonparticipating share-based awards (in shares) 0 35,270
Diluted weighted average shares outstanding (in shares) 65,373,285 64,355,247
Earnings per share - Basic (in dollars per share) $ 0.82 $ 0.84
Earnings per share - Diluted (in dollars per share) $ 0.82 $ 0.84