XML 42 R31.htm IDEA: XBRL DOCUMENT
v3.20.2

Compensation and Benefits (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2020
Share-based Payment Arrangement [Abstract] |
Components of Compensation Expense | Total compensation and benefits consists of the following:
| For the Three Months Ended September 30, |  | For the Nine Months Ended September 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
Salaries, incentive compensation and benefits (1) | $ | 99,517 |  |  | $ | 89,969 |  |  | $ | 288,186 |  |  | $ | 267,198 |
Restricted share-based award compensation expense | 9,140 |  |  | 9,878 |  |  | 27,392 |  |  | 33,417 |
Total compensation and benefits | $ | 108,657 |  |  | $ | 99,847 |  |  | $ | 315,578 |  |  | $ | 300,615 |
(1) Excluding restricted share-based award compensation expense
Restricted Share-Based Award Activity | The following tables summarize the restricted share-based award activity for the nine months ended September 30, 2020:
| Weighted-Average Grant Date Fair Value |  | Restricted Stock Awards and Restricted Stock Units
Unvested at January 1, 2020 | $ | 35.00 |  |  | 5,005,422 |
Granted | 33.80 |  |  | 919,455 |
Forfeited | 30.71 |  |  | (40,101) |
Vested | 32.59 |  |  | (588,144) |
Unvested at September 30, 2020 | $ | 35.09 |  |  | 5,296,632 |
Nonvested Restricted Stock Shares Activity |
| Weighted-Average Grant Date Fair Value |  | Performance Share Units
Unvested at January 1, 2020 | $ | — |  |  | — |
Granted | 52.45 |  |  | 60,000 |
Forfeited | — |  |  | — |
Vested | — |  |  | — |
Unvested at September 30, 2020 | $ | 52.45 |  |  | 60,000 |

X
- Definition Tabular disclosure of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including equity-based compensation, and pension and other postretirement benefit expense. + References No definition available. + Details
Name: | apam_ScheduleOfLaborAndRelatedExpenseTableTextBlock
Namespace Prefix: | apam_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
Name: | us-gaap_NonvestedRestrictedStockSharesActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
Name: | us-gaap_ScheduleOfSharebasedCompensationRestrictedStockAndRestrictedStockUnitsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration