Supp Guarantor Cond Cons Fin Stmts - B/S (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 10,358	$ 10,446		$ 12,042		$ 8,121
Accounts receivable, net	232,832			413,195
Accounts receivable-affiliates	7,496			7,823
Inventories	344,026			450,482
Brokerage margin deposits	32,296			34,466
Derivative assets	48,571			4,564
Prepaid expenses and other current assets	93,397			81,940
Total current assets	768,976			1,004,512
Property and equipment, net	1,075,084			1,104,863
Right of use assets, net	282,025			296,746
Intangible assets, net	41,340			46,765
Goodwill	323,889			324,474
Other assets	30,964			31,067
Total assets	2,522,278			2,808,427
Current liabilities:
Accounts payable	163,351			373,386
Working capital revolving credit facility - current portion	41,700			148,900
Current portion	41,700			148,900
Lease liability - current portion	70,622			68,160
Environmental liabilities-current portion	5,009			5,009
Trustee taxes payable	43,739			42,932
Accrued expenses and other current liabilities	94,586			102,802
Derivative liabilities	8,089			12,698
Total current liabilities	427,096			753,887
Working capital revolving credit facility-less current portion	175,000			175,000
Revolving credit facility	188,000			192,700
Senior notes	691,355			690,533
Long-term lease liability-less current portion	223,547			239,349
Environmental liabilities-less current portion	51,290			54,262
Financing obligations	147,400			148,127
Deferred tax liabilities	54,999			42,879
Other long-term liabilities	55,085			52,451
Total liabilities	2,013,772			2,349,188
Partners' equity
Total Global Partners LP equity	507,422			458,065
Noncontrolling interest	1,084			1,174
Total partners' equity	508,506	486,007	$ 440,092	459,239	$ 489,522	499,194
Total liabilities and partners' equity	2,522,278			2,808,427
Reportable Legal Entities [Member] | (Issuer) Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	9,027	9,988		11,591		7,050
Accounts receivable, net	232,594			412,853
Accounts receivable-affiliates	7,496			7,823
Inventories	344,026			450,482
Brokerage margin deposits	32,296			34,466
Derivative assets	48,571			4,564
Prepaid expenses and other current assets	93,146			81,845
Total current assets	767,156			1,003,624
Property and equipment, net	1,073,386			1,102,644
Right of use assets, net	281,960			296,672
Intangible assets, net	41,340			46,765
Goodwill	323,889			324,474
Other assets	30,964			31,067
Total assets	2,518,695			2,805,246
Current liabilities:
Accounts payable	162,822			373,355
Accounts payable - affiliates	(26)			(17)
Working capital revolving credit facility - current portion	41,700			148,900
Current portion	41,700			148,900
Lease liability - current portion	70,604			68,143
Environmental liabilities-current portion	5,009			5,009
Trustee taxes payable	43,739			42,932
Accrued expenses and other current liabilities	94,403			102,737
Derivative liabilities	8,089			12,698
Total current liabilities	426,340			753,757
Working capital revolving credit facility-less current portion	175,000			175,000
Revolving credit facility	188,000			192,700
Senior notes	691,355			690,533
Long-term lease liability-less current portion	223,504			239,308
Environmental liabilities-less current portion	51,290			54,262
Financing obligations	147,400			148,127
Deferred tax liabilities	54,999			42,879
Other long-term liabilities	55,085			52,451
Total liabilities	2,012,973			2,349,017
Partners' equity
Total Global Partners LP equity	505,722			456,229
Total partners' equity	505,722			456,229
Total liabilities and partners' equity	2,518,695			2,805,246
Reportable Legal Entities [Member] | Non-Guarantor Subsidiary
Current assets:
Cash and cash equivalents	1,331	$ 458		451		$ 1,071
Accounts receivable, net	171			339
Accounts receivable-affiliates	67			3
Prepaid expenses and other current assets	251			95
Total current assets	1,820			888
Property and equipment, net	1,698			2,219
Right of use assets, net	65			74
Total assets	3,583			3,181
Current liabilities:
Accounts payable	529			31
Accounts payable - affiliates	26			17
Lease liability - current portion	18			17
Accrued expenses and other current liabilities	183			65
Total current liabilities	756			130
Long-term lease liability-less current portion	43			41
Total liabilities	799			171
Partners' equity
Total Global Partners LP equity	1,700			1,836
Noncontrolling interest	1,084			1,174
Total partners' equity	2,784			3,010
Total liabilities and partners' equity	3,583			3,181
Eliminations
Current assets:
Accounts receivable, net	67			3
Accounts receivable-affiliates	$ (67)			$ (3)
Global Partners Wholly-Owned Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Ownership interest (as a percent)	100.00%	100.00%