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Earnings Per Share - Computation of basic and diluted net income (loss) per share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net income attributable to APAM	$ 336,516	$ 212,617	$ 156,536
Less allocation to participating securities	31,430	23,268	21,154
Net income (loss) available to common stockholders	$ 305,086	$ 189,349	$ 135,382
Basic weighted average shares outstanding	59,866,790	55,633,529	51,127,929
Dilutive effect of nonparticipating equity awards	14,249	4,393	0
Diluted weighted average number of common shares outstanding	59,881,039	55,637,922	51,127,929
Earnings per share - Basic	$ 5.10	$ 3.40	$ 2.65
Earnings per share - Diluted	$ 5.09	$ 3.40	$ 2.65

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