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Earnings Per Share (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2025 and 2024 were as follows:
For the Three Months Ended June 30,
For the Six Months Ended June 30,
Basic and Diluted Earnings Per Share2025202420252024
Numerator:
Net income attributable to APAM$67,555 $57,574 $128,694 $117,055 
Less: Allocation to participating securities5,974 5,435 11,886 9,760 
Net income available to common stockholders$61,581 $52,139 $116,808 $107,295 
Denominator:
Basic weighted average shares outstanding65,645,108 64,960,740 65,509,947 64,640,358 
Dilutive effect of nonparticipating share-based awards— 37,759 — 36,515 
Diluted weighted average shares outstanding65,645,108 64,998,499 65,509,947 64,676,873 
Earnings per share - Basic $0.94 $0.80 $1.78 $1.66 
Earnings per share - Diluted$0.94 $0.80 $1.78 $1.66 
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 June 30,
For the Six Months Ended June 30,
Anti-Dilutive Weighted Average Shares Outstanding2025202420252024
Holdings limited partnership units10,235,519 10,468,232 10,254,947 10,685,799 
Unvested restricted share-based awards5,366,155 5,519,516 5,379,080 5,496,352 
Total15,601,674 15,987,748 15,634,027 16,182,151