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Cover Page - shares
 9 Months Ended
Sep. 30, 2023
Oct. 27, 2023
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2023  
Document Transition Report false  
Entity File Number 001-34452  
Entity Registrant Name Apollo Commercial Real Estate Finance, Inc.  
Entity Incorporation, State or Country Code MD  
Entity Tax Identification Number 27-0467113  
Entity Address, Address Line One 9 West 57th Street  
Entity Address, Address Line Two 42nd Floor  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10019  
City Area Code 212  
Local Phone Number 515–3200  
Title of 12(b) Security Common Stock, $0.01 par value  
Trading Symbol ARI  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Small Business Entity false  
Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   141,358,605
Amendment Flag false  
Document Fiscal Year Focus 2023  
Document Fiscal Period Focus Q3  
Entity Central Index Key 0001467760  
Current Fiscal Year End Date --12-31