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Equity-Based Compensation - Additional Information (Details)
$ in Millions
1 Months Ended 12 Months Ended
Nov. 30, 2020
USD ($)
shares
Jul. 31, 2020
NonEmployeeDirector
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum number of common units authorized | shares     1,505,000    
Phantom units granted | shares     60,418 33,193  
Phantom Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Phantom units granted | shares 48,112 4,102      
Number of non-employee directors to whom Phantom Units are granted. | NonEmployeeDirector   3      
Vesting rights description     50% vest ratably over three years through December 31, 2023 and 50% vest upon the employee’s death, disability or retirement.    
Vesting percentage 50.00%        
Remaining vesting rights percentage based upon employee's death, disability or retirement 50.00%        
Vesting period 3 years        
Performance Based Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance-based awards with an initial target value $ 0.9        
Percentage of performance-based awards are weighted for increase of funds flow from operations per unit     65.00%    
Percentage of Performance Based Awards for Leverage     35.00%    
Number of days the value of common units divided by volume weighted average closing price 20 days        
Performance Based Awards [Member] | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of payout value for both performance conditions interpolated on linear basis 0.00%        
Performance Based Awards [Member] | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of payout value for both performance conditions interpolated on linear basis 200.00%        
Partnership Equity-Based Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Equity-based employee and directors compensation expense     $ 0.1 $ 0.9  
Partnership Equity-Based Awards [Member] | GP Purchase [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Equity-based employee and directors compensation expense       0.5  
C S T Equity Based Awards | Circle K Omnibus Agreement [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Equity-based employee and directors compensation expense       $ 0.3 $ 0.3