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Related-Party Transactions - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended
Apr. 14, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]            
Rental income   $ 21,498,000 $ 19,747,000 $ 62,832,000 $ 62,859,000  
Accounts receivable from related parties   836,000   836,000   $ 931,000
Accounts payable to related parties   9,205,000   9,205,000   5,379,000
Incentive distribution         133,000  
Cost of services   909,391,000 528,750,000 2,306,047,000 1,225,470,000  
Lease expenses   5,968,000 6,036,000 17,912,000 19,088,000  
Topper Group Omnibus Agreement [Member] | Joes Kwik Marts [Member]            
Related Party Transaction [Line Items]            
Cost and expenses incurred   16,900,000 12,000,000.0 42,700,000 26,100,000  
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   15,700,000 9,400,000 41,400,000 12,200,000  
Accounts receivable from related parties   800,000   $ 800,000   700,000
Date of fuel supply to related parties       Apr. 14, 2020    
Rent expense   2,300,000 2,100,000 $ 6,800,000 4,000,000.0  
Accounts payable to related parties   300,000   300,000   100,000
Cost of services   800,000 100,000 1,700,000 400,000  
Topper Group [Member]            
Related Party Transaction [Line Items]            
Revenue from Related Parties       0    
Cost and expenses incurred       200,000    
Incentive distribution         100,000  
Dividends cash   $ 7,600,000 9,700,000 27,100,000 $ 27,400,000  
Lease expenses   insignificant     insignificant  
Lease expenses       100,000    
Topper Group [Member] | Topper Group Omnibus Agreement [Member]            
Related Party Transaction [Line Items]            
Accounts payable to related parties   $ 6,800,000   6,800,000   3,700,000
John B. Reilly, III [Member]            
Related Party Transaction [Line Items]            
Dividends cash   2,600,000 500,000 3,600,000 $ 1,500,000  
Topper And Entities [Member]            
Related Party Transaction [Line Items]            
Accounts payable to related parties   1,900,000   1,900,000   $ 1,500,000
Merchandise costs   5,200,000 5,800,000 14,500,000 10,900,000  
CST Brands Inc. [Member]            
Related Party Transaction [Line Items]            
Rent expense   $ 300,000 $ 300,000 $ 900,000 $ 800,000