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PROPERTY AND EQUIPMENT - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Property, Plant and Equipment [Abstract]
Capitalized general and administrative costs	$ 5.4	$ 5.0	$ 10.5	$ 9.7

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- Definition

General and administrative costs capitalized to the full cost pool.

+ References

No definition available.

+ Details

Name:	gpor_CapitalizedGeneralAndAdministrativeCosts
Namespace Prefix:	gpor_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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