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Earnings Per Share - Computation of basic and diluted net income (loss) per share (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net income attributable to APAM	$ 212,617	$ 156,536	$ 158,309
Less allocation to participating securities	23,268	21,154	19,447
Net income (loss) available to common stockholders	$ 189,349	$ 135,382	$ 138,862
Basic weighted average shares outstanding	55,633,529	51,127,929	48,862,435
Dilutive effect of nonparticipating equity awards	4,393	0	0
Diluted weighted average number of common shares outstanding	55,637,922	51,127,929	48,862,435

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