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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified | 0 Months Ended |  |
--- | --- | --- | ---
Nov. 01, 2012 | Mar. 13, 2015 | Mar. 11, 1997 well | Mar. 31, 2015 | Dec. 31, 2014
Commitments [Line Items] |  |  |  |  |
Plugging And Abandonment Escrow Account |  |  |  | $ 3,089 gpor_PluggingAndAbandonmentEscrowAccount | $ 3,097 gpor_PluggingAndAbandonmentEscrowAccount
Employment Agreement, Term | 3 years |  |  |  |
Employment Agreement, Subsequent Extension | 1 year |  |  |  |
Employment Agreement, Notice Period Allowed For Termination | 90 days |  |  |  |
Other Commitment |  |  |  | 183,540 us-gaap_OtherCommitment |
Chief Executive Officer [Member] |  |  |  |  |
Commitments [Line Items] |  |  |  |  |
Other Commitment |  |  |  | 400 us-gaap_OtherCommitment / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember |
Chief Operating Officer [Member] |  |  |  |  |
Commitments [Line Items] |  |  |  |  |
Employment Agreement, Term |  | 2 years |  |  |
Chief Financial Officer [Member] |  |  |  |  |
Commitments [Line Items] |  |  |  |  |
Employment Agreement, Term |  | 3 years |  |  |
Management [Member] |  |  |  |  |
Commitments [Line Items] |  |  |  |  |
Other Commitment |  |  |  | 2,000 us-gaap_OtherCommitment / us-gaap_TitleOfIndividualAxis = us-gaap_ManagementMember |
WCBB [Member] |  |  |  |  |
Commitments [Line Items] |  |  |  |  |
Purchasing Remaining Percent Interest In Oil And Gas Property |  |  | 50.00%gpor_PurchasingRemainingPercentInterestInOilAndGasProperty / us-gaap_BusinessAcquisitionAxis = gpor_WcbbMember |  |
Payments Held For Restricted Cash |  |  | $ 18 gpor_PaymentsHeldForRestrictedCash / us-gaap_BusinessAcquisitionAxis = gpor_WcbbMember |  |
Significant Plugging Commitment Minimum Number Of Wells To Be Plugged |  |  | 20 gpor_SignificantPluggingCommitmentMinimumNumberOfWellsToBePlugged / us-gaap_BusinessAcquisitionAxis = gpor_WcbbMember |  |
Tenure Of Minimum Wells To Be Plugged |  |  | 20 years |  |
Number Of Wells Plugged |  |  |  | 463 gpor_NumberOfWellsPlugged / us-gaap_BusinessAcquisitionAxis = gpor_WcbbMember |

X
- Details
Name: | gpor_CommitmentsLineItems
Namespace Prefix: | gpor_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Employment Agreement, Notice Period Allowed For Termination + References No definition available. + Details
Name: | gpor_EmploymentAgreementNoticePeriodAllowedForTermination
Namespace Prefix: | gpor_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Employment Agreement, Subsequent Extension + References No definition available. + Details
Name: | gpor_EmploymentAgreementSubsequentExtension
Namespace Prefix: | gpor_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Employment Agreement, Term + References No definition available. + Details
Name: | gpor_EmploymentAgreementTerm
Namespace Prefix: | gpor_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Wells Plugged + References No definition available. + Details
Name: | gpor_NumberOfWellsPlugged
Namespace Prefix: | gpor_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition payments to plugging and abandonment escrow account. + References No definition available. + Details
Name: | gpor_PaymentsHeldForRestrictedCash
Namespace Prefix: | gpor_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Plugging And Abandonment Escrow Account + References No definition available. + Details
Name: | gpor_PluggingAndAbandonmentEscrowAccount
Namespace Prefix: | gpor_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Purchasing remaining percent interest in oil and gas property. + References No definition available. + Details
Name: | gpor_PurchasingRemainingPercentInterestInOilAndGasProperty
Namespace Prefix: | gpor_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum number of wells required to be plugged annually. + References No definition available. + Details
Name: | gpor_SignificantPluggingCommitmentMinimumNumberOfWellsToBePlugged
Namespace Prefix: | gpor_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tenure of minimum wells to be plugged + References No definition available. + Details
Name: | gpor_TenureOfMinimumWellsToBePlugged
Namespace Prefix: | gpor_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=gpor_WcbbMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TitleOfIndividualAxis=us-gaap_ChiefExecutiveOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TitleOfIndividualAxis=us-gaap_ChiefFinancialOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TitleOfIndividualAxis=us-gaap_ChiefOperatingOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TitleOfIndividualAxis=us-gaap_ManagementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |