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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2025
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, 2025 and 2024 were as follows:
For the Three Months Ended September 30,
 For the Nine Months Ended September 30,
Basic and Diluted Earnings Per Share2025202420252024
Numerator:
Net income attributable to APAM$66,830 $72,990 $195,524 $190,045 
Less: Allocation to participating securities5,582 6,176 16,384 16,068 
Net income available to common stockholders$61,248 $66,814 $179,140 $173,977 
Denominator:
Basic weighted average shares outstanding65,666,782 65,123,054 65,562,800 64,802,431 
Dilutive effect of nonparticipating share-based awards— 39,844 — 37,625 
Diluted weighted average shares outstanding65,666,782 65,162,898 65,562,800 64,840,056 
Earnings per share - Basic $0.93 $1.03 $2.73 $2.68 
Earnings per share - Diluted$0.93 $1.03 $2.73 $2.68 
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 Outstanding2025202420252024
Holdings limited partnership units10,235,519 10,353,310 10,248,400 10,574,160 
Unvested restricted share-based awards5,334,895 5,460,311 5,364,190 5,484,250 
Total15,570,414 15,813,621 15,612,590 16,058,410