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Related Party Transactions - Additional Information (Details)
12 Months Ended
Apr. 14, 2020
USD ($)
Jan. 15, 2020
Dec. 31, 2021
USD ($)
Store
$ / gal
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Related Party Transaction [Line Items]          
Rental income     $ 83,182,000 $ 83,233,000 $ 90,139,000
Accounts receivable from related parties     1,149,000 931,000  
Rent expense     38,627,000 35,362,000 28,557,000
Accounts payable to related parties     7,679,000 5,379,000  
Incentive distribution       133,000 533,000
Cost of services     3,302,306,000 1,720,196,000 1,994,792,000
Income from CST Fuel Supply equity interests       3,202,000 14,768,000
General and Administrative Expenses [Member]          
Related Party Transaction [Line Items]          
Rent expense     $ 1,331,000 1,081,000 685,000
CST Brands Inc. [Member]          
Related Party Transaction [Line Items]          
Fuel purchase commitments of fixed markup on cost per gallon | $ / gal     0.05    
Topper Group Omnibus Agreement [Member]          
Related Party Transaction [Line Items]          
Partnership agreement effective date   Jan. 01, 2020      
Topper Group Omnibus Agreement [Member] | Joes Kwik Marts [Member]          
Related Party Transaction [Line Items]          
Cost and expenses incurred     $ 62,500,000 38,400,000  
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       3,200,000 14,800,000
DMS [Member] | Retail and Wholesale Acquisition [Member]          
Related Party Transaction [Line Items]          
Revenue from Related Parties $ 0        
Topper And Entities [Member]          
Related Party Transaction [Line Items]          
Rental income     $ 58,000,000.0 21,000,000.0 300,000
Accounts receivable from related parties     $ 1,300,000 700,000  
Date of fuel supply to related parties     Apr. 14, 2020    
Rent expense     $ 9,300,000 6,600,000 1,100,000
Accounts payable to related parties       100,000  
Cost of services     2,200,000 600,000 1,000,000.0
Topper Group [Member]          
Related Party Transaction [Line Items]          
Revenue from Related Parties     0    
Rent expense     100,000 100,000  
Cost and expenses incurred     200,000 200,000  
Incentive distribution       100,000  
Dividends cash     34,700,000 37,100,000 16,000,000.0
Topper Group [Member] | Topper Group Omnibus Agreement [Member]          
Related Party Transaction [Line Items]          
Right of termination prior written notice period   180 days      
Accounts payable to related parties     6,100,000 3,700,000  
The General Partner [Member] | Topper Group Omnibus Agreement [Member]          
Related Party Transaction [Line Items]          
Right of termination prior written notice period   60 days      
John B. Reilly, III [Member]          
Related Party Transaction [Line Items]          
Dividends cash     6,200,000 2,000,000.0 2,000,000.0
Topper And Entities [Member]          
Related Party Transaction [Line Items]          
Accounts payable to related parties     1,500,000 1,500,000  
Merchandise costs     19,700,000 14,400,000  
CST Brands Inc. [Member]          
Related Party Transaction [Line Items]          
Rent expense     1,300,000 1,100,000 700,000
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
Circle K Stores Inc. [Member]          
Related Party Transaction [Line Items]          
Incentive distribution         500,000
Dividends cash         15,700,000
Number of Stores | Store     42    
Number of retail sites leased to related party | Store     11    
Lessor leasing arrangements, operating leases, initial term     10 years    
Circle K Stores Inc. [Member] | Jet-Pep Assets Acquisition [Member]          
Related Party Transaction [Line Items]          
Purchases from related party       $ 40,100,000 263,500,000
Circle K Stores Inc. [Member] | Transitional Omnibus Agreement and Circle K Omnibus Agreement [Member] | General and Administrative Expenses [Member]          
Related Party Transaction [Line Items]          
Cost and expenses incurred         $ 11,600,000