Net Income Per Common Limited Partner Unit (Details) - USD ($) $ / shares in Units, $ in Thousands					3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 20, 2020	Apr. 27, 2020	Apr. 16, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Net (Loss) Income Per Limited Partner Unit
Repurchased units not deemed outstanding					154,741		154,741		128,170
Net income attributable to Global Partners LP					$ 76,262	$ 14,489	$ 79,538	$ 21,615
Declared distribution					15,701	17,895	29,177	35,606
Assumed allocation of undistributed net (loss) income					60,561	(3,406)	50,361	(13,991)
Assumed allocation of net income					$ 76,262	$ 14,489	$ 79,538	$ 21,615
Common Limited Partners
Denominator:
Basic weighted average limited partner units outstanding					33,869,000	33,755,000	33,869,000	33,754,000
Diluted weighted average limited partner units outstanding					34,204,000	34,286,000	34,248,000	34,259,000
Basic net income per limited partner unit (in dollars per unit)					$ 2.19	$ 0.37	$ 2.23	$ 0.52
Diluted net income per limited partner unit (in dollars per unit)					$ 2.17	$ 0.36	$ 2.21	$ 0.51
Quarterly cash distributions declared (in dollars per unit)			$ 0.39375
Common Limited Partners | Subsequent event
Denominator:
Quarterly cash distributions declared (in dollars per unit)	$ 0.45875
Series A Preferred Limited Partners
Denominator:
Quarterly cash distributions declared (in dollars per unit)				$ 0.609375
Series A Preferred Limited Partners | Subsequent event
Denominator:
Quarterly cash distributions declared (in dollars per unit)		$ 0.609375
Limited Partner Interest
Net (Loss) Income Per Limited Partner Unit
Net income attributable to Global Partners LP					$ 75,751	$ 14,123	$ 79,005	$ 20,945
Declared distribution					15,595	17,508	28,980	34,846
Assumed allocation of undistributed net (loss) income					60,156	(3,385)	50,025	(13,901)
Assumed allocation of net income					75,751	14,123	$ 79,005	$ 20,945
Denominator:
Basic weighted average limited partner units outstanding							33,869,000	33,754,000
Dilutive effect of phantom units							379,000	505,000
Diluted weighted average limited partner units outstanding							34,248,000	34,259,000
Basic net income per limited partner unit (in dollars per unit)							$ 2.23	$ 0.52
Diluted net income per limited partner unit (in dollars per unit)							$ 2.21	$ 0.51
Limited Partner Interest | Common Limited Partners
Net (Loss) Income Per Limited Partner Unit
Assumed allocation of net income					$ 74,069	$ 12,441	$ 75,641	$ 17,581
Denominator:
Basic weighted average limited partner units outstanding					33,869,000	33,755,000
Dilutive effect of phantom units					335,000	531,000
Diluted weighted average limited partner units outstanding					34,204,000	34,286,000
Basic net income per limited partner unit (in dollars per unit)					$ 2.19	$ 0.37
Diluted net income per limited partner unit (in dollars per unit)					$ 2.17	$ 0.36
Limited Partner Interest | Series A Preferred Limited Partners
Net (Loss) Income Per Limited Partner Unit
Assumed allocation of net income					$ 1,682	$ 1,682	3,364	3,364
General Partner, Global GP LLC
Net (Loss) Income Per Limited Partner Unit
Net income attributable to Global Partners LP					511	366	533	670
Declared distribution					106	118	197	235
Assumed allocation of undistributed net (loss) income					405	(21)	336	(90)
Assumed allocation of net income					$ 511	97	$ 533	145
IDRs
Net (Loss) Income Per Limited Partner Unit
Declared distribution						269		525
Assumed allocation of net income						$ 269		$ 525