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DERIVATIVE INSTRUMENTS - Narrative (Details)	9 Months Ended
	Sep. 30, 2022
Minimum
Derivative [Line Items]
Percentage of forecasted annual production	50.00%
Term of contract	12 months
Maximum
Derivative [Line Items]
Percentage of forecasted annual production	75.00%
Term of contract	24 months

X

- Definition

Derivative, Percentage Of Forecasted Annual Production

+ References

No definition available.

+ Details

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Namespace Prefix:	gpor_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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