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Related-Party Transactions - Additional Information (Details) - USD ($)
3 Months Ended
Apr. 14, 2020
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Related Party Transaction [Line Items]        
Rental income   $ 20,472,000 $ 22,688,000  
Accounts receivable from related parties   935,000   $ 931,000
Accounts payable to related parties   5,855,000   5,379,000
Incentive distribution     133,000  
Cost of services   602,416,000 355,966,000  
Topper Group Omnibus Agreement [Member]        
Related Party Transaction [Line Items]        
Cost and expenses incurred   12,800,000 3,500,000  
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   11,200,000 100,000  
Accounts receivable from related parties   $ 800,000   700,000
Date of fuel supply to related parties   Apr. 14, 2020    
Rent expense   $ 2,300,000 300,000  
Accounts payable to related parties   100,000   100,000
Cost of services   400,000 100,000  
Topper Group [Member]        
Related Party Transaction [Line Items]        
Cost and expenses incurred   100,000    
Incentive distribution     100,000  
Dividends cash   $ 9,700,000 7,900,000  
Lease expenses   insignificant    
Topper Group [Member] | Topper Group Omnibus Agreement [Member]        
Related Party Transaction [Line Items]        
Accounts payable to related parties   $ 3,700,000   3,700,000
Topper And Entities [Member]        
Related Party Transaction [Line Items]        
Accounts payable to related parties   1,800,000   $ 1,500,000
Merchandise costs   4,200,000    
CST Brands Inc. [Member]        
Related Party Transaction [Line Items]        
Rent expense   $ 300,000 $ 200,000