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Equity-Based Compensation - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Allocated Share-based Compensation Expense   $ 100 $ 100 $ 300 $ 100  
Liability related awards       200   $ 100
Equity-based employee and directors compensation expense       547 340  
Unrecognized compensation expense associated with CST restricted stock units granted   100   100   $ 300
Amended and Restated Omnibus Agreement [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Equity-based employee and directors compensation expense   $ 100 $ 100 $ 200 $ 200  
Phantom Performance Units [Member] | Amended and Restated Omnibus Agreement [Member] | Circle K [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting rights description       35% vest upon the third anniversary of the grant date of such awards. The remaining 65% are subject to performance conditions relating to fuel volume, Adjusted EBITDA and employee engagement.    
Number of shares granted 14,712          
Remaining vesting rights percentage subject to performance conditions 65.00%          
Phantom Performance Units [Member] | Amended and Restated Omnibus Agreement [Member] | Circle K [Member] | Third Anniversary [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage 35.00%          
Phantom Units [Member] | Members of Board of Directors [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares granted 16,440          
Vesting period 1 year