Business Combinations - ProForma (Details) - Capitol Petroleum Group
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
Supplemental Pro-Forma Information  
Sales | $ $ 10,540,275
Net income attributable to Global Partners LP | $ $ 47,555
Net income per limited partner unit, basic | $ / shares $ 1.24
Net income per limited partner unit, diluted | $ / shares $ 1.23