XML 20 R1.htm IDEA: XBRL DOCUMENT v3.20.4
Document and Entity Information Document - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Feb. 19, 2021
Jun. 30, 2020
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2020    
Document Transition Report false    
Entity File Number 001-35826    
Entity Registrant Name Artisan Partners Asset Management Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 45-0969585    
Entity Address, Address Line One 875 E. Wisconsin Avenue    
Entity Address, Address Line Two Suite 800    
Entity Address, City or Town Milwaukee    
Entity Address, State or Province WI    
Entity Address, Postal Zip Code 53202    
City Area Code 414    
Local Phone Number 390-6100    
Title of 12(b) Security Class A Common Stock, $0.01 par value    
Trading Symbol APAM    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Central Index Key 0001517302    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Entity Emerging Growth Company false    
Entity Small Business false    
Entity Shell Company false    
ICFR Auditor Attestation Flag true    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Public Float     $ 2,000,000
Share Price (in dollars per share)     $ 32.50
Class A Common Stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   62,981,300  
Class B Common Stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   4,457,958  
Class C Common Stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   10,983,145