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PROPERTY AND EQUIPMENT - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Property, Plant and Equipment [Abstract] |  |  |  |
Capitalized general and administrative costs | $ (6.4) | $ (6.3) | $ (12.7) | $ (12.0)

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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