| Document and Entity Information | Apr. 29, 2024 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001467760 |
| Document Type | 8-K |
| Document Period End Date | Apr. 29, 2024 |
| Entity Registrant Name | Apollo Commercial Real Estate Finance, Inc. |
| Entity Incorporation State Country Code | MD |
| Entity File Number | 001-34452 |
| Entity Tax Identification Number | 27-0467113 |
| Entity Address, Address Line One | c/o Apollo Global Management, Inc. |
| Entity Address, Address Line Two | 9 West 57th Street |
| Entity Address, Address Line Three | 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.01 par value |
| Trading Symbol | ARI |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
