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Related Party Transactions - Additional Information (Details)
1 Months Ended 3 Months Ended 11 Months Ended 12 Months Ended
Apr. 01, 2019
USD ($)
gal
May 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Sep. 30, 2017
Store
Sep. 30, 2019
USD ($)
Store
Dec. 31, 2018
USD ($)
Nov. 18, 2019
USD ($)
Store
$ / gal
gal
Dec. 31, 2019
USD ($)
Site
$ / gal
Dec. 31, 2018
USD ($)
Property
Dec. 31, 2017
USD ($)
Property
Jan. 01, 2020
gal
Oct. 29, 2019
USD ($)
Jun. 30, 2018
USD ($)
Store
Related Party Transaction [Line Items]                          
Accounts receivable from related parties           $ 9,697,000   $ 4,299,000 $ 9,697,000        
Income from CST Fuel Supply equity interests               14,768,000 14,948,000 $ 14,906,000      
Cost of services               1,994,792,000 2,273,122,000 1,934,061,000      
Payment of leasehold interest                 485,000        
Accounts payable to related parties           25,045,000   431,000 25,045,000        
Incentive distribution               533,000 1,579,000 4,337,000      
Contributions from parent company                 6,306,000 329,000      
Rental income               $ 90,139,000 $ 85,642,000 $ 86,314,000      
Properties Disposed Upon FTC's Requirement [Member]                          
Related Party Transaction [Line Items]                          
Number of properties sold | Property                 9 2      
Consideration received on property sale                   $ 6,700,000      
Gain on sales of assets, net                   2,200,000      
CST Brands Inc. [Member]                          
Related Party Transaction [Line Items]                          
Fuel purchase commitments of fixed markup on cost per gallon | $ / gal               0.05          
Wholesale Fuel Supply Contracts/Rights [Member] | CST Brands Inc. [Member]                          
Related Party Transaction [Line Items]                          
Equity method investment, ownership percentage               17.50%          
Income from CST Fuel Supply equity interests               $ 14,800,000 $ 14,900,000 14,900,000      
Omnibus Agreement [Member]                          
Related Party Transaction [Line Items]                          
Accounts payable to related parties               9,200,000          
Accounts payable to related parties, noncurrent               4,600,000          
Circle K Stores Inc. [Member]                          
Related Party Transaction [Line Items]                          
Number of Stores | Store             47            
Number of retail sites leased to related party | Store             46            
Lessor leasing arrangements, operating leases, initial term             10 years            
Payment of leasehold interest   $ 500,000 $ 500,000                    
Amounts payable to fuel purchases and freight commissions to related parties           4,300,000   13,900,000 4,300,000        
Incentive distribution             $ 500,000   1,600,000 4,300,000      
Dividends cash             15,700,000   16,200,000 17,000,000      
Circle K Stores Inc. [Member] | Properties Disposed Upon FTC's Requirement [Member]                          
Related Party Transaction [Line Items]                          
Contributions from parent company           6,300,000       300,000      
Circle K Stores Inc. [Member] | Franchise [Member]                          
Related Party Transaction [Line Items]                          
Cost of services             $ 500,000   1,000,000        
Circle K Stores Inc. [Member] | Fuel Sales Transaction [Member]                          
Related Party Transaction [Line Items]                          
Accounts receivable from related parties           2,600,000   3,100,000 2,600,000        
Circle K Stores Inc. [Member] | Fuel Supply Equity Interest Transaction [Member]                          
Related Party Transaction [Line Items]                          
Accounts receivable from related parties           1,000,000   900,000 1,000,000        
Circle K Stores Inc. [Member] | Annual Commitment [Member]                          
Related Party Transaction [Line Items]                          
Fuel purchase agreements | gal             114,900,000            
Fuel purchase commitments margin payable per gallon | $ / gal             0.05            
Circle K Stores Inc. [Member] | Omnibus Agreement [Member]                          
Related Party Transaction [Line Items]                          
Cost and expenses incurred               11,600,000 11,800,000 13,900,000      
Accounts payable to related parties           20,200,000   11,500,000 20,200,000        
Payment of related party charges               14,200,000          
Circle K Stores Inc. [Member] | Omnibus Agreement [Member] | General and Administrative Expenses [Member]                          
Related Party Transaction [Line Items]                          
Severance, benefit, and retention costs             $ 100,000   800,000        
Circle K Stores Inc. [Member] | Jet-Pep Assets Acquisition [Member]                          
Related Party Transaction [Line Items]                          
Purchases from related party               $ 263,500,000 191,000,000 11,300,000      
Circle K Stores Inc. [Member] | Amended and Restated Omnibus Agreement [Member]                          
Related Party Transaction [Line Items]                          
Account payable settlement by parties                       $ 183,000  
CST Brands Inc. [Member]                          
Related Party Transaction [Line Items]                          
Equity method investment, ownership percentage               17.50%          
Number of sites sold | Store       61                  
Rent expense               $ 700,000 700,000 700,000      
CST Brands Inc. [Member] | CST Marketing and Supply [member]                          
Related Party Transaction [Line Items]                          
Ownership interest               100.00%          
CST Brands Inc. [Member] | Annual Commitment [Member]                          
Related Party Transaction [Line Items]                          
Initial term of agreement               10 years          
Couche-Tard [Member]                          
Related Party Transaction [Line Items]                          
Commission on transportation costs               $ 900,000 500,000        
DMS [Member]                          
Related Party Transaction [Line Items]                          
Number of Stores | Store         12               43
Accounts receivable from related parties           5,600,000   $ 4,100,000 5,600,000        
Accounts payable to related parties                         $ 3,800,000
Decrease in rental income $ 500,000                        
Number of sites covered by master lease agreement | Site               70          
Fuel purchase agreement reduced per gallon | gal 0.01                        
Number of remaining fuel deliveries covered by fuel supply agreement | Site               85          
Write off of deferred rent income charges         $ 600,000     $ 2,400,000          
Earn-out payment receivable                   $ 800,000      
DMS [Member] | Subsequent Event [Member]                          
Related Party Transaction [Line Items]                          
Additional fuel purchase agreement reduced per gallon | gal                     0.005    
DMR [Member]                          
Related Party Transaction [Line Items]                          
Number of properties sold | Property                   29      
Consideration received on property sale                   $ 18,900,000      
Gain on sales of assets, net                   800,000      
Topper And Entities [Member]                          
Related Party Transaction [Line Items]                          
Cost of services               1,000,000 1,800,000 1,500,000      
Accounts payable to related parties           $ 400,000   100,000 400,000        
Rental income               300,000 300,000 500,000      
Rent expense               1,100,000 1,000,000 900,000      
Company Affiliated with a Member of the Board [Member]                          
Related Party Transaction [Line Items]                          
Cost of services related to public relations and website consulting               $ 100,000 $ 100,000 $ 100,000