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Organization and Basis of Presentation (Details)
6 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2013
item
Dec. 31, 2012
Jun. 30, 2013
Affiliates of general partner
Mar. 02, 2012
Alliance
AE Holdings
Mar. 02, 2012
Alliance
AE Holdings
Members of Slifka family
Feb. 28, 2013
Basin Transload LLC
Feb. 01, 2013
Basin Transload LLC
Feb. 15, 2013
Cascade Kelly
Organization                
Number of owned, leased and/or supplied gasoline stations 900              
Percentage of outstanding membership interests acquired       100.00%   60.00% 60.00% 100.00%
Affiliate ownership percentage of seller in acquisition         95.00%      
Number of independent directors of the general partner's board of directors serving on the conflicts committee 3              
General partner interest (as a percent) 0.83%              
Number of common units held 27,393,786 27,310,648 11,546,993          
Limited partner ownership interest (as a percent)     42.10%