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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Supplemental Income Statement Information [Line Items]                      
Gross profit $ 35,045 $ 41,145 $ 41,370 $ 37,077 $ 45,074 $ 43,798 $ 43,972 $ 39,951 $ 154,637 $ 172,795 $ 160,766
Net income                 18,076 5,246 23,176
CST Brands Inc. [Member]                      
Supplemental Income Statement Information [Line Items]                      
Gross profit 21,088 23,039 21,870 21,013 21,597 20,665 21,584 22,152 87,010 85,998 86,880
Net income $ 20,675 $ 22,597 $ 21,434 $ 20,604 $ 21,128 $ 20,270 $ 21,162 $ 21,745 $ 85,310 $ 84,305 $ 85,174