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PROPERTY AND EQUIPMENT - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Property, Plant and Equipment [Abstract] |  |  |  |
Capitalized general and administrative costs | $ 5.7 | $ 4.9 | $ 16.2 | $ 14.6

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- Definition General and administrative costs capitalized to the full cost pool. + References No definition available. + Details
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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