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Related Party Transactions (Details) (USD $)
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12 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Sep. 28, 2012
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| Related Party Transaction [Line Items] |
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| Lease operating expenses |
$ 52,191,000us-gaap_LeaseOperatingExpense
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$ 26,703,000us-gaap_LeaseOperatingExpense
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$ 24,308,000us-gaap_LeaseOperatingExpense
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| General and administrative |
38,290,000us-gaap_GeneralAndAdministrativeExpense
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22,519,000us-gaap_GeneralAndAdministrativeExpense
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13,808,000us-gaap_GeneralAndAdministrativeExpense
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| Ownership percentage by noncontrolling owners |
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10.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
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| Windsor Niobrara LLC [Member] |
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| Related Party Transaction [Line Items] |
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| Revenue from related parties |
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900,000us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_WindsorNiobraraLlcMember
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| Windsor Ohio LLC [Member] |
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| Related Party Transaction [Line Items] |
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| Due from (to) related party |
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(1,600,000)us-gaap_RelatedPartyTransactionDueFromToRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_WindsorOhioLlcMember
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| Revenue from related parties |
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73,400,000us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_WindsorOhioLlcMember
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| Stingray Pressure Pumping LLC [Member] |
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| Related Party Transaction [Line Items] |
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| Due from (to) related party |
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8,300,000us-gaap_RelatedPartyTransactionDueFromToRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_StingrayPressurePumpingLlcMember
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| Oil and natural gas properties |
78,300,000gpor_OilAndGasPropertyFullCostMethodAmountsCapitalizedDuringPeriod
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_StingrayPressurePumpingLlcMember
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58,300,000gpor_OilAndGasPropertyFullCostMethodAmountsCapitalizedDuringPeriod
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_StingrayPressurePumpingLlcMember
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| Ownership interest |
50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_StingrayPressurePumpingLlcMember
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| Stingray Cementing LLC [Member] |
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| Related Party Transaction [Line Items] |
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| Due from (to) related party |
800,000us-gaap_RelatedPartyTransactionDueFromToRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_StingrayCementingLlcMember
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1,500,000us-gaap_RelatedPartyTransactionDueFromToRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_StingrayCementingLlcMember
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| Oil and natural gas properties |
6,000,000gpor_OilAndGasPropertyFullCostMethodAmountsCapitalizedDuringPeriod
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_StingrayCementingLlcMember
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4,000,000gpor_OilAndGasPropertyFullCostMethodAmountsCapitalizedDuringPeriod
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_StingrayCementingLlcMember
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| Ownership interest |
50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_StingrayCementingLlcMember
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| Stingray Energy Services LLC [Member] |
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| Related Party Transaction [Line Items] |
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| Due from (to) related party |
6,000,000us-gaap_RelatedPartyTransactionDueFromToRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_StingrayEnergyServicesLlcMember
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4,100,000us-gaap_RelatedPartyTransactionDueFromToRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_StingrayEnergyServicesLlcMember
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| Oil and natural gas properties |
24,800,000gpor_OilAndGasPropertyFullCostMethodAmountsCapitalizedDuringPeriod
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_StingrayEnergyServicesLlcMember
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5,100,000gpor_OilAndGasPropertyFullCostMethodAmountsCapitalizedDuringPeriod
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_StingrayEnergyServicesLlcMember
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| Ownership interest |
50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_StingrayEnergyServicesLlcMember
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| Athena Construction Llc [Member] |
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| Related Party Transaction [Line Items] |
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| Due from (to) related party |
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1,000,000us-gaap_RelatedPartyTransactionDueFromToRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_AthenaConstructionLlcMember
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| Lease operating expenses |
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600,000us-gaap_LeaseOperatingExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_AthenaConstructionLlcMember
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| Oil and natural gas properties |
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4,100,000gpor_OilAndGasPropertyFullCostMethodAmountsCapitalizedDuringPeriod
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_AthenaConstructionLlcMember
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| Panther Drilling Systems, LLC [Member] |
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| Related Party Transaction [Line Items] |
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| Due from (to) related party |
2,400,000us-gaap_RelatedPartyTransactionDueFromToRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_PantherDrillingSystemsLLCMember
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1,800,000us-gaap_RelatedPartyTransactionDueFromToRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_PantherDrillingSystemsLLCMember
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| Oil and natural gas properties |
7,600,000gpor_OilAndGasPropertyFullCostMethodAmountsCapitalizedDuringPeriod
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_PantherDrillingSystemsLLCMember
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12,600,000gpor_OilAndGasPropertyFullCostMethodAmountsCapitalizedDuringPeriod
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_PantherDrillingSystemsLLCMember
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| Ownership interest |
30.50%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_PantherDrillingSystemsLLCMember
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| Redback Directional Services, LLC [Member] |
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| Related Party Transaction [Line Items] |
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| Due from (to) related party |
(400,000)us-gaap_RelatedPartyTransactionDueFromToRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_RedbackDirectionalServicesLLCMember
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0us-gaap_RelatedPartyTransactionDueFromToRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_RedbackDirectionalServicesLLCMember
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| Oil and natural gas properties |
1,000,000gpor_OilAndGasPropertyFullCostMethodAmountsCapitalizedDuringPeriod
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_RedbackDirectionalServicesLLCMember
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100,000gpor_OilAndGasPropertyFullCostMethodAmountsCapitalizedDuringPeriod
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_RedbackDirectionalServicesLLCMember
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| Ownership interest |
30.50%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_RedbackDirectionalServicesLLCMember
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| Muskie Holdings LLC [Member] |
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| Related Party Transaction [Line Items] |
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| Due from (to) related party |
28,400,000us-gaap_RelatedPartyTransactionDueFromToRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_MuskieHoldingsLlcMember
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| Oil and natural gas properties |
11,100,000gpor_OilAndGasPropertyFullCostMethodAmountsCapitalizedDuringPeriod
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_MuskieHoldingsLlcMember
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| Ownership interest |
30.50%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_MuskieHoldingsLlcMember
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| Caliber Development Company, LLC [Member] |
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| Related Party Transaction [Line Items] |
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| General and administrative |
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200,000us-gaap_GeneralAndAdministrativeExpense
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_CaliberDevelopmentCompanyLlcMember
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| Executive Officer [Member] | Windsor Niobrara LLC [Member] |
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| Related Party Transaction [Line Items] |
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| Ownership percentage by noncontrolling owners |
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10.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_WindsorNiobraraLlcMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
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| Executive Officer [Member] | Windsor Ohio LLC [Member] |
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| Related Party Transaction [Line Items] |
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| Ownership percentage by noncontrolling owners |
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10.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_WindsorOhioLlcMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
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| Executive Officer [Member] | Athena Construction Llc [Member] |
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| Related Party Transaction [Line Items] |
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| Ownership percentage by noncontrolling owners |
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10.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_AthenaConstructionLlcMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
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| Executive Officer [Member] | Black Fin P Llc [Member] |
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| Related Party Transaction [Line Items] |
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| Ownership percentage by noncontrolling owners |
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10.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_BlackFinPLlcMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
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| Executive Officer [Member] | Panther Drilling Systems, LLC [Member] |
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| Related Party Transaction [Line Items] |
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| Ownership percentage by noncontrolling owners |
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10.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_PantherDrillingSystemsLLCMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
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| Executive Officer [Member] | Redback Directional Services, LLC [Member] |
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| Related Party Transaction [Line Items] |
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| Ownership percentage by noncontrolling owners |
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10.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_RedbackDirectionalServicesLLCMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
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| Executive Officer [Member] | Caliber Development Company, LLC [Member] |
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| Related Party Transaction [Line Items] |
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| Ownership percentage by noncontrolling owners |
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10.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_CaliberDevelopmentCompanyLlcMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
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| Mammoth Energy Partners LP [Member] |
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| Related Party Transaction [Line Items] |
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| Ownership interest |
30.50%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= gpor_MammothEnergyPartnersLPMember
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| Lease Operating Expense [Member] | Stingray Energy Services LLC [Member] |
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| Related Party Transaction [Line Items] |
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| Due from (to) related party |
$ 1,300,000us-gaap_RelatedPartyTransactionDueFromToRelatedParty
/ us-gaap_IncomeStatementLocationAxis
= gpor_LeaseOperatingExpenseMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_StingrayEnergyServicesLlcMember
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$ 1,300,000us-gaap_RelatedPartyTransactionDueFromToRelatedParty
/ us-gaap_IncomeStatementLocationAxis
= gpor_LeaseOperatingExpenseMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_StingrayEnergyServicesLlcMember
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| Mammoth Energy Partners LP [Member] | Wexford [Member] |
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| Related Party Transaction [Line Items] |
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| Other Ownership Interest, Percentage |
69.50%gpor_OtherOwnershipInterestPercentage
/ us-gaap_CounterpartyNameAxis
= gpor_MammothEnergyPartnersLPMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= gpor_WexfordMember
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