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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2024
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, 2024 and 2023 were as follows:
 For the Three Months Ended September 30, For the Nine Months Ended September 30,
Basic and Diluted Earnings Per Share2024202320242023
Numerator:
Net income attributable to APAM$72,990 $53,155 $190,045 $157,533 
Less: Allocation to participating securities6,176 4,691 16,068 13,799 
Net income available to common stockholders$66,814 $48,464 $173,977 $143,734 
Denominator:
Basic weighted average shares outstanding65,123,054 63,520,402 64,802,431 63,419,587 
Dilutive effect of nonparticipating share-based awards39,844 42,642 37,625 30,217 
Diluted weighted average shares outstanding65,162,898 63,563,044 64,840,056 63,449,804 
Earnings per share - Basic $1.03 $0.76 $2.68 $2.27 
Earnings per share - Diluted$1.03 $0.76 $2.68 $2.27 
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 Outstanding2024202320242023
Holdings limited partnership units10,353,310 11,487,400 10,574,160 11,517,987 
Unvested restricted share-based awards5,460,311 5,586,181 5,484,250 5,571,819 
Total15,813,621 17,073,581 16,058,410 17,089,806