| Document and Entity Information | Aug. 09, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Aug. 9, 2021 |
| Entity Registrant Name | CrossAmerica Partners LP |
| Entity Central Index Key | 0001538849 |
| Entity Emerging Growth Company | false |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-35711 |
| Entity Tax Identification Number | 45-4165414 |
| Entity Address, Address Line One | 600 Hamilton Street |
| Entity Address, Address Line Two | Suite 500 |
| Entity Address, City or Town | Allentown |
| Entity Address, State or Province | PA |
| Entity Address, Postal Zip Code | 18101 |
| City Area Code | 610 |
| Local Phone Number | 625-8000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Units |
| Trading Symbol | CAPL |
| Security Exchange Name | NYSE |
