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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		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net income attributable to APAM	$ 46,151	$ 39,188	$ 80,976	$ 70,727
Less: Allocation to participating securities	6,001	5,340	12,155	12,524
Net income available to common stockholders	$ 40,150	$ 33,848	$ 68,821	$ 58,203
Basic and diluted weighted average number of common share outstanding (in shares)	55,884,366	51,242,911	54,574,923	50,697,329
Earnings per share (in dollars per share)	$ 0.72	$ 0.66	$ 1.26	$ 1.15
Dilutive securities outstanding (in shares)	0	0	0	0

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