Organization and Basis of Presentation (Details)
1 Months Ended 12 Months Ended
Jun. 30, 2015
May 31, 2015
Dec. 31, 2014
Nov. 30, 2014
Dec. 31, 2016
item
shares
Dec. 31, 2015
shares
Organization            
Number of owned, leased and/or supplied gasoline stations | item         1,458  
Number of convenience stores | item         248  
General partner interest (as a percent) 0.67% 0.74% 0.74% 0.83% 0.67%  
Number of common units held | shares         33,543,669 33,506,844
Limited partner ownership interest (as a percent)   99.26%   99.17% 99.33%  
General partner units            
Organization            
General partner interest (as a percent)         0.67%  
Affiliates of general partner            
Organization            
General partner interest (as a percent)         21.90%  
Number of common units held | shares         7,433,829