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COMMITMENTS - Schedule of Firm Sales Contracted with Third Parties (Details)	Dec. 31, 2021 MMBTU
Commitments and Contingencies Disclosure [Abstract]
2021 (MMBtu per day)	4,000

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- Definition

Supply Commitment, Due in Next Twelve Months

+ References

No definition available.

+ Details

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Namespace Prefix:	gpor_
Data Type:	dtr-types:energyItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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