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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2018
Feb. 12, 2019
Jun. 30, 2018
Document And Entity Information [Abstract]      
Document type 10-K    
Amendment flag false    
Document period end date Dec. 31, 2018    
Document fiscal year focus 2018    
Document fiscal period focus FY    
Trading symbol ARI    
Entity registrant name Apollo Commercial Real Estate Finance, Inc.    
Entity central index key 0001467760    
Current fiscal year end date --12-31    
Entity well-known seasoned issuer Yes    
Entity current reporting status Yes    
Entity voluntary filers No    
Shell company false    
Entity filer category Large Accelerated Filer    
Emerging growth company false    
Small business entity false    
Entity common stock, shares outstanding   134,287,398  
Entity public float     $ 2,193,170,128