Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2021	Nov. 04, 2021
Cover [Abstract]
Entity Registrant Name	CROSSAMERICA PARTNERS LP
Entity Central Index Key	0001538849
Document Type	10-Q
Document Period End Date	Sep. 30, 2021
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Trading Symbol	CAPL
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		37,891,701
Entity Interactive Data Current	Yes
Entity Shell Company	false
Title of 12(b) Security	Common Units
Security Exchange Name	NYSE
Entity File Number	001-35711
Entity Tax Identification Number	45-4165414
Entity Address, Address Line One	645 Hamilton Street
Entity Address, Address Line Two	Suite 400
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
Document Quarterly Report	true
Document Transition Report	false
Entity Incorporation, State or Country Code	DE