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Summary of Significant Accounting Policies - Taxes (Details)	12 Months Ended
	Dec. 31, 2025 item
Income Taxes
Number of wholly owned subsidiaries which are taxable for federal and state income tax purposes	1

X

- References

No definition available.

+ Details

Name:	glp_IncomeTaxesAbstract
Namespace Prefix:	glp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of wholly owned subsidiaries of the entity which are taxable for federal and state income tax purposes.

+ References

No definition available.

+ Details

Name:	glp_NumberOfWhollyOwnedSubsidiariesWhichAreTaxableForFederalAndStateIncomeTaxPurposes
Namespace Prefix:	glp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration