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Partners' Equity, Allocations and Cash Distribution - Preferred Units (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Feb. 14, 2019
USD ($)
Jan. 22, 2019
USD ($)
$ / shares
Nov. 15, 2018
USD ($)
$ / shares
Nov. 14, 2018
USD ($)
$ / shares
Aug. 14, 2018
USD ($)
$ / shares
Aug. 07, 2018
USD ($)
$ / shares
shares
May 15, 2018
USD ($)
$ / shares
Feb. 14, 2018
USD ($)
$ / shares
Nov. 14, 2017
USD ($)
$ / shares
Aug. 14, 2017
USD ($)
$ / shares
May 15, 2017
USD ($)
$ / shares
Feb. 14, 2017
USD ($)
$ / shares
Nov. 14, 2016
USD ($)
$ / shares
Aug. 12, 2016
USD ($)
$ / shares
May 16, 2016
USD ($)
$ / shares
Feb. 16, 2016
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
item
$ / shares
shares
Dec. 31, 2017
shares
Partners' Equity, Allocations and Cash Distributions                                    
Per Unit Cash Distribution (in dollars per unit)       $ 0.4750 $ 0.4750   $ 0.4625 $ 0.4625 $ 0.4625 $ 0.4625 $ 0.4625 $ 0.4625 $ 0.4625 $ 0.4625 $ 0.4625 $ 0.4625    
Liquidation preference (in dollars per unit)           $ 25.00                        
Number of units held | shares                                 33,995,563  
General partner interest, equivalent units outstanding | shares                                 230,303 230,303
General partner interest (as a percent)                                 0.67%  
Net proceeds from issuance of Series A preferred units | $                                 $ 66,366  
Number of quarters of cash reserves to provide funds for distributions to unitholders and General Partner | item                                 4  
First Target Distribution [Member] | Maximum                                    
Partners' Equity, Allocations and Cash Distributions                                    
Total Quarterly Distribution Target Amount (in dollars per unit)                                 $ 0.4625  
Second Target Distribution [Member] | Minimum                                    
Partners' Equity, Allocations and Cash Distributions                                    
Total Quarterly Distribution Target Amount (in dollars per unit)                                 0.4625  
Second Target Distribution [Member] | Maximum                                    
Partners' Equity, Allocations and Cash Distributions                                    
Total Quarterly Distribution Target Amount (in dollars per unit)                                 0.5375  
Third Target Distribution [Member] | Minimum                                    
Partners' Equity, Allocations and Cash Distributions                                    
Total Quarterly Distribution Target Amount (in dollars per unit)                                 0.5375  
Third Target Distribution [Member] | Maximum                                    
Partners' Equity, Allocations and Cash Distributions                                    
Total Quarterly Distribution Target Amount (in dollars per unit)                                 0.6625  
Thereafter | Minimum                                    
Partners' Equity, Allocations and Cash Distributions                                    
Total Quarterly Distribution Target Amount (in dollars per unit)                                 $ 0.6625  
Global Partners LP [Member]                                    
Partners' Equity, Allocations and Cash Distributions                                    
Limited partner ownership interest (as a percent)                                 99.33%  
Affiliates of general partner                                    
Partners' Equity, Allocations and Cash Distributions                                    
Number of units held | shares                                 7,340,941  
Affiliates of general partner | Global Partners LP [Member]                                    
Partners' Equity, Allocations and Cash Distributions                                    
Limited partner ownership interest (as a percent)                                 21.60%  
Common Limited Partners                                    
Partners' Equity, Allocations and Cash Distributions                                    
Number of units held | shares                                 33,751,435 33,645,092
Period of distribution of available cash after end of each quarter                                 45 days  
Common Limited Partners | Subsequent event                                    
Partners' Equity, Allocations and Cash Distributions                                    
Cash distribution | $ $ 17,300                                  
Series A Preferred Limited Partners                                    
Partners' Equity, Allocations and Cash Distributions                                    
Per Unit Cash Distribution (in dollars per unit)     $ 0.6635                              
Cash distribution | $     $ 1,800                              
Initial distribution rate (as a percentage)           9.75%                     9.75%  
Liquidation preference (in dollars per unit)                                 $ 25.00  
Number of units held | shares                                 0 0
Number of units sold | shares           2,760,000                        
Sale price (in dollars per unit)           $ 25.00                        
Net proceeds from issuance of Series A preferred units | $           $ 66,400                        
Series A Preferred Limited Partners | Subsequent event                                    
Partners' Equity, Allocations and Cash Distributions                                    
Per Unit Cash Distribution (in dollars per unit)   $ 0.609375                                
Cash distribution | $   $ 1,700                                
Series A Preferred Limited Partners | London Interbank Offered Rate (LIBOR) [Member]                                    
Partners' Equity, Allocations and Cash Distributions                                    
Interest rate margin (as a percent)                                 6.774%  
Limited Partner Interest                                    
Partners' Equity, Allocations and Cash Distributions                                    
Cash distribution | $       $ 16,149 $ 16,149   $ 15,723 $ 15,723 $ 15,723 $ 15,723 $ 15,723 $ 15,723 $ 15,723 $ 15,723 $ 15,723 $ 15,723    
Limited Partner Interest | First Target Distribution [Member]                                    
Partners' Equity, Allocations and Cash Distributions                                    
Marginal Percentage Interest in Distributions                                 99.33%  
Limited Partner Interest | Second Target Distribution [Member]                                    
Partners' Equity, Allocations and Cash Distributions                                    
Marginal Percentage Interest in Distributions                                 86.33%  
Limited Partner Interest | Third Target Distribution [Member]                                    
Partners' Equity, Allocations and Cash Distributions                                    
Marginal Percentage Interest in Distributions                                 76.33%  
Limited Partner Interest | Thereafter                                    
Partners' Equity, Allocations and Cash Distributions                                    
Marginal Percentage Interest in Distributions                                 51.33%  
Limited Partner Interest | Common Limited Partners                                    
Partners' Equity, Allocations and Cash Distributions                                    
Marginal Percentage Interest in Distributions                                 99.33%  
General Partner, Global GP LLC                                    
Partners' Equity, Allocations and Cash Distributions                                    
Marginal Percentage Interest in Distributions                                 0.67%  
General Partner, Global GP LLC | First Target Distribution [Member]                                    
Partners' Equity, Allocations and Cash Distributions                                    
Marginal Percentage Interest in Distributions                                 0.67%  
General Partner, Global GP LLC | Second Target Distribution [Member]                                    
Partners' Equity, Allocations and Cash Distributions                                    
Marginal Percentage Interest in Distributions                                 13.67%  
General Partner, Global GP LLC | Third Target Distribution [Member]                                    
Partners' Equity, Allocations and Cash Distributions                                    
Marginal Percentage Interest in Distributions                                 23.67%  
General Partner, Global GP LLC | Thereafter                                    
Partners' Equity, Allocations and Cash Distributions                                    
Marginal Percentage Interest in Distributions                                 48.67%  
Annualized Basis [Member] | Series A Preferred Limited Partners                                    
Partners' Equity, Allocations and Cash Distributions                                    
Total Quarterly Distribution Target Amount (in dollars per unit)                                 $ 2.4375  
Annualized Basis [Member] | Series A Preferred Limited Partners | Subsequent event                                    
Partners' Equity, Allocations and Cash Distributions                                    
Per Unit Cash Distribution (in dollars per unit)   $ 2.4375