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Commitments - Schedule of Firm Sales Contracted with Third Parties (Details) MMBTU / d in Thousands | Dec. 31, 2016 MMBTU / d
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Commitments and Contingencies Disclosure [Abstract] |
2017 | 516
2018 | 257
2019 | 226
2020 | 223
2021 | 126
Thereafter | 31
Total | 1,379

X
- Definition Supply Commitment, Due After Fifth Year + References No definition available. + Details
Name: | gpor_SupplyCommitmentDueAfterFifthYear
Namespace Prefix: | gpor_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Supply Commitment, Due in Next Twelve Months + References No definition available. + Details
Name: | gpor_SupplyCommitmentDueinNextTwelveMonths
Namespace Prefix: | gpor_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Supply Commitment, Due in Year Five + References No definition available. + Details
Name: | gpor_SupplyCommitmentDueinYearFive
Namespace Prefix: | gpor_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Supply Commitment, Due in Year Four + References No definition available. + Details
Name: | gpor_SupplyCommitmentDueinYearFour
Namespace Prefix: | gpor_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Supply Commitment, Due in Year Three + References No definition available. + Details
Name: | gpor_SupplyCommitmentDueinYearThree
Namespace Prefix: | gpor_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Supply Commitment, Due in Year Two + References No definition available. + Details
Name: | gpor_SupplyCommitmentDueinYearTwo
Namespace Prefix: | gpor_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Supply Commitment, Total + References No definition available. + Details
Name: | gpor_SupplyCommitmentTotal
Namespace Prefix: | gpor_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration