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Document and Entity Information (USD $)
 12 Months Ended
Dec. 31, 2013
Feb. 20, 2014
Jun. 30, 2012
Entity Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2013    
Document Fiscal Year Focus 2013    
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 No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Common Stock, Shares Outstanding   37,125,475  
Entity Public Float     $ 581,396,403