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SUBSEQUENT EVENT (Narrative) (Details) - Subsequent Event $ in Billions	Apr. 28, 2021 USD ($)
Minimum
Subsequent Event [Line Items]
Bankruptcy claims, amount of claims filed	$ 1.3
Maximum
Subsequent Event [Line Items]
Bankruptcy claims, amount of claims filed	$ 1.9

X

- Definition

Bankruptcy Proceedings, Enterprise Value Of Successor

+ References

No definition available.

+ Details

Name:	gpor_BankruptcyProceedingsEnterpriseValueOfSuccessor
Namespace Prefix:	gpor_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: