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Organization and Basis of Presentation (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
segment
Sep. 30, 2012
Oct. 21, 2013
PAGP
Subsequent Event
Organization          
General partner ownership interest (as a percent) 2.00% 2.00% 2.00% 2.00%  
Related party ownership of general partner interest (as a percent)         21.80%
Operating segments number     3