Segment Reporting - Schedule of Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019		Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Total revenues	$ 591,022	$ 559,736		$ 1,381,119	$ 1,637,050
Rental income	19,747	22,921		62,859	66,519
Income from CST Fuel Supply equity interests		3,927		3,202	11,087
Operating income (loss)	23,692	12,349		107,453	33,881
Fuel Sales to External Customers [Member]
Segment Reporting Information [Line Items]
Total revenues	522,894	526,096		1,230,331	1,518,830
Food and Merchandise Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	46,266	9,598	[1]	83,178	47,875	[1]
Other Revenue [Member]
Segment Reporting Information [Line Items]
Total revenues	2,115	1,121	[1]	4,751	3,826	[1]
Unallocated [Member]
Segment Reporting Information [Line Items]
Total revenues	(128,478)	(76,491)		(254,850)	(247,381)
Operating income (loss)	(11,104)	(19,693)		11,447	(54,036)
Unallocated [Member] | Fuel Sales to External Customers [Member]
Segment Reporting Information [Line Items]
Total revenues	(128,478)	(76,491)		(254,850)	(247,381)
Wholesale [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	485,189	524,376		1,172,567	1,508,374
Rental income	17,144	20,734		55,275	60,188
Income from CST Fuel Supply equity interests		3,927		3,202	11,087
Operating income (loss)	34,500	31,519		94,984	85,487
Wholesale [Member] | Operating Segments [Member] | Fuel Sales to External Customers [Member]
Segment Reporting Information [Line Items]
Total revenues	339,277	426,161		860,737	1,198,486
Wholesale [Member] | Operating Segments [Member] | Other Revenue [Member]
Segment Reporting Information [Line Items]
Total revenues	290	990	[1]	1,705	2,319	[1]
Wholesale [Member] | Intersegment [Member] | Fuel Sales to External Customers [Member]
Segment Reporting Information [Line Items]
Total revenues	128,478	76,491		254,850	247,381
Retail [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Total revenues	234,311	111,851		463,402	376,057
Rental income	2,603	2,187		7,584	6,331
Operating income (loss)	296	523		1,022	2,430
Retail [Member] | Operating Segments [Member] | Fuel Sales to External Customers [Member]
Segment Reporting Information [Line Items]
Total revenues	183,617	99,935		369,594	320,344
Retail [Member] | Operating Segments [Member] | Food and Merchandise Sales [Member]
Segment Reporting Information [Line Items]
Total revenues	46,266	9,598	[1]	83,178	47,875	[1]
Retail [Member] | Operating Segments [Member] | Other Revenue [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 1,825	$ 131	[1]	$ 3,046	$ 1,507	[1]

[1] We reclassified revenues related to certain ancillary items such as car wash revenue, lottery commissions and ATM commissions from revenues from food and merchandise sales to other revenue to conform to the current year presentation, which amounted to $0.1 million and $1.5 million for the three and nine months ended September 30, 2019, respectively.