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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2020
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method | The computation of basic and diluted earnings per share for the three and nine months ended September 30, 2020 and 2019 were as follows:
| For the Three Months Ended September 30, |  | For the Nine Months Ended September 30,
Basic and Diluted Earnings Per Share | 2020 |  | 2019 |  | 2020 |  | 2019
Numerator: |  |  |  |  |  |  |
Net income attributable to APAM | $ | 58,527 |  |  | $ | 41,256 |  |  | $ | 139,503 |  |  | $ | 111,983 |
Less: Allocation to participating securities | 6,006 |  |  | 4,494 |  |  | 16,944 |  |  | 16,521 |
Net income available to common stockholders | $ | 52,521 |  |  | $ | 36,762 |  |  | $ | 122,559 |  |  | $ | 95,462 |
Denominator: |  |  |  |  |  |  |
Basic weighted average shares outstanding | 56,402,503 |  |  | 51,448,938 |  |  | 55,188,563 |  |  | 50,950,618 |
Dilutive effect of nonparticipating equity awards | 5,769 |  |  | — |  |  | 1,923 |  |  | — |
Diluted weighted average shares outstanding | 56,408,272 |  |  | 51,448,938 |  |  | 55,190,486 |  |  | 50,950,618 |
Earnings per share - Basic | $ | 0.93 |  |  | $ | 0.71 |  |  | $ | 2.22 |  |  | $ | 1.87 |
Earnings per share - Diluted | $ | 0.93 |  |  | $ | 0.71 |  |  | $ | 2.22 |  |  | $ | 1.87 |
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 Three Months Ended September 30, |  | For the Nine Months Ended September 30,
Anti-Dilutive Weighted Average Shares Outstanding | 2020 |  | 2019 |  | 2020 |  | 2019
Holdings limited partnership units | 17,177,313 |  |  | 21,594,086 |  |  | 18,308,766 |  |  | 21,958,470 |
Unvested restricted share-based awards | 5,389,854 |  |  | 5,060,127 |  |  | 5,323,596 |  |  | 5,033,331 |
Total | 22,567,167 |  |  | 26,654,213 |  |  | 23,632,362 |  |  | 26,991,801 |

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of the effect of income (loss) on basic earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=120380238&loc=d3e4984-109258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1278-109256 + Details
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