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Related-Party Transactions - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Apr. 14, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]            
Rental income   $ 20,862,000 $ 20,424,000 $ 41,334,000 $ 43,112,000  
Accounts receivable from related parties   1,147,000   1,147,000   $ 931,000
Accounts payable to related parties   6,400,000   6,400,000   5,379,000
Incentive distribution         133,000  
Cost of services   794,240,000 340,754,000 1,396,656,000 696,720,000  
Topper Group Omnibus Agreement [Member]            
Related Party Transaction [Line Items]            
Cost and expenses incurred   13,000,000.0 10,600,000 25,800,000 14,200,000  
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   14,600,000 2,800,000 25,800,000 2,800,000  
Accounts receivable from related parties   900,000   $ 900,000   700,000
Date of fuel supply to related parties       Apr. 14, 2020    
Rent expense   2,200,000 1,600,000 $ 4,500,000 1,900,000  
Accounts payable to related parties   300,000   300,000   100,000
Cost of services   400,000 200,000 900,000 300,000  
Topper Group [Member]            
Related Party Transaction [Line Items]            
Cost and expenses incurred   100,000   200,000    
Incentive distribution         100,000  
Dividends cash   $ 9,700,000 $ 9,700,000 $ 19,400,000 $ 17,700,000  
Lease expenses   insignificant insignificant insignificant insignificant  
Topper Group [Member] | Topper Group Omnibus Agreement [Member]            
Related Party Transaction [Line Items]            
Accounts payable to related parties   $ 3,900,000   $ 3,900,000   3,700,000
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   5,000,000.0 $ 5,100,000 9,200,000 $ 5,100,000  
CST Brands Inc. [Member]            
Related Party Transaction [Line Items]            
Rent expense   $ 400,000 $ 300,000 $ 700,000 $ 500,000