Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Supplemental Cash Flow Elements [Abstract]
Borrowing from working capital revolving credit facility	$ 303,600	$ 418,200
Payment on working capital revolving credit facility	(401,300)	(331,100)
Net (payments on) borrowings from working capital revolving credit facility	(97,700)	87,100
Borrowings from revolving credit facility		15,000
Payments on revolving credit facility	(16,000)	(8,900)
Net (payments on) borrowings from revolving credit facility	$ (16,000)	$ 6,100

The net cash inflow due to borrowings from revolving credit facilities.

No definition available.

Name:	glp_BorrowingsFromRevolvingCreditFacilities
Namespace Prefix:	glp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

This element represents the borrowings from working capital revolving credit facility during the reporting period.

No definition available.

Name:	glp_BorrowingsFromWorkingCapitalRevolvingCreditFacility
Namespace Prefix:	glp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The net cash outflow due to payments on revolving credit facilities.

No definition available.

Name:	glp_PaymentsOnRevolvingCreditFacility
Namespace Prefix:	glp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

This element represents the payments on working capital revolving credit facility during the reporting period.

No definition available.

Name:	glp_PaymentsOnWorkingCapitalRevolvingCreditFacility
Namespace Prefix:	glp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The net cash inflow (outflow) from borrowings (repayments) on the non-working capital revolving credit facility during the period.

No definition available.

Name:	glp_ProceedsFromPaymentsOnNonWorkingCapitalRevolvingCreditFacility
Namespace Prefix:	glp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The net cash inflow (outflow) from borrowings (repayments) on the working capital revolving credit facility during the period.

No definition available.

Name:	glp_ProceedsFromPaymentsOnWorkingCapitalRevolvingCreditFacility
Namespace Prefix:	glp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

No definition available.

Name:	us-gaap_SupplementalCashFlowElementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration