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Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Computation of basic and diluted net income (loss) per share

The computation of basic and diluted earnings per share for the years ended December 31, 2020, 2019 and 2018 were as follows:

			For the Years Ended December 31,
Basic and Diluted Earnings Per Share			2020						2019						2018
Numerator:
Net income attributable to APAM			$	212,617					$	156,536					$	158,309
Less: Allocation to participating securities			23,268						21,154						19,447
Net income available to common stockholders			$	189,349					$	135,382					$	138,862
Denominator:
Basic weighted average shares outstanding			55,633,529						51,127,929						48,862,435
Dilutive effect of nonparticipating equity awards			4,393						—						—
Diluted weighted average shares outstanding			55,637,922						51,127,929						48,862,435
Earnings per share - Basic			$	3.40					$	2.65					$	2.84
Earnings per share - Diluted			$	3.40					$	2.65					$	2.84

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following table summarizes the weighted-average shares outstanding that are excluded from the calculation of diluted earnings per share because their effect would have been anti-dilutive:

			For the Years Ended December 31,
Anti-Dilutive Weighted Average Shares Outstanding			2020						2019						2018
Holdings limited partnership units			17,885,335						21,827,809						23,351,440
Unvested restricted share-based awards			5,313,466						5,026,357						4,813,895
Total			23,198,801						26,854,166						28,165,335

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Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities.

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Tabular disclosure of the effect of income (loss) on basic earnings per share.

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