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Related Party Transactions - Schedule of Supplemental Income Statement Information for CST Fuel Supply (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Mar. 25, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Supplemental Income Statement Information [Line Items]                        
Gross profit $ 56,478 $ 62,272 $ 57,648 $ 35,729   $ 35,045 $ 41,145 $ 41,370 $ 37,077 $ 212,127 $ 154,637 $ 172,795
Net income                   $ 107,456 18,076 5,246
CST Brands Inc. [Member]                        
Supplemental Income Statement Information [Line Items]                        
Gross profit         $ 17,820           87,010 85,998
Net income         $ 17,476           $ 85,310 $ 84,305