New Accounting Standards (Details)	12 Months Ended
Dec. 31, 2016
New Accounting Standards
Percentage of physical contracts	40.00%

Represents the percentage of revenue recognized originated as forward physical contracts.

No definition available.

Name:	glp_PercentageOfRevenueRecognizedOriginatedAsForwardPhysicalContracts
Namespace Prefix:	glp_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration