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Equity Investments (Investments Accounted For By The Equity Method) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Oct. 11, 2012
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity investments and investments in subsidiaries | $ 374,971 us-gaap_EquityMethodInvestments |  | $ 369,581 us-gaap_EquityMethodInvestments |
(Income) loss from equity method investments | (19,975)us-gaap_IncomeLossFromEquityMethodInvestments | (128,475)us-gaap_IncomeLossFromEquityMethodInvestments |  |
Tatex Thailand II, LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Approximate Ownership % | 23.50%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_TatexThailandIiLlcMember |  |  |
(Income) loss from equity method investments | 0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_TatexThailandIiLlcMember | 0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_TatexThailandIiLlcMember |  |
Tatex Thailand III, LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Approximate Ownership % | 17.90%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_TatexThailandIiiLlcMember |  |  |
Equity investments and investments in subsidiaries | 0 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_TatexThailandIiiLlcMember |  |  |
(Income) loss from equity method investments | 0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_TatexThailandIiiLlcMember | 49 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_TatexThailandIiiLlcMember |  |
Grizzly Oil Sands ULC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Approximate Ownership % | 24.9999%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember |  |  |
Equity investments and investments in subsidiaries | 167,186 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember |  | 180,218 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember |
(Income) loss from equity method investments | 4,142 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember | 2,001 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember |  |
Bison Drilling And Field Services LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Approximate Ownership % | 0.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_BisonDrillingAndFieldServicesLlcMember |  |  |
(Income) loss from equity method investments | 0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_BisonDrillingAndFieldServicesLlcMember | 1,933 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_BisonDrillingAndFieldServicesLlcMember |  |
Muskie Proppant LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Approximate Ownership % | 0.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_MuskieHoldingsLlcMember |  |  |
(Income) loss from equity method investments | 0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_MuskieHoldingsLlcMember | 534 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_MuskieHoldingsLlcMember |  |
Timber Wolf Terminals LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Approximate Ownership % | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_TimberWolfTerminalsLlcMember |  |  |
Equity investments and investments in subsidiaries | 1,007 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_TimberWolfTerminalsLlcMember |  | 1,013 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_TimberWolfTerminalsLlcMember |
(Income) loss from equity method investments | 6 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_TimberWolfTerminalsLlcMember | 0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_TimberWolfTerminalsLlcMember |  |
Windsor Midstream LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Approximate Ownership % | 22.50%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_WindsorMidstreamLlcMember |  |  |
Equity investments and investments in subsidiaries | 32,292 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_WindsorMidstreamLlcMember |  | 13,505 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_WindsorMidstreamLlcMember |
(Income) loss from equity method investments | (18,787)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_WindsorMidstreamLlcMember | (168)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_WindsorMidstreamLlcMember |  |
Stingray Pressure Pumping LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Approximate Ownership % | 0.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_StingrayPressurePumpingLlcMember |  |  |
(Income) loss from equity method investments | 0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_StingrayPressurePumpingLlcMember | 513 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_StingrayPressurePumpingLlcMember |  |
Stingray Cementing LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Approximate Ownership % | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_StingrayCementingLlcMember |  |  |
Equity investments and investments in subsidiaries | 2,254 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_StingrayCementingLlcMember |  | 2,647 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_StingrayCementingLlcMember |
(Income) loss from equity method investments | 67 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_StingrayCementingLlcMember | 95 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_StingrayCementingLlcMember |  |
Blackhawk Midstream LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Approximate Ownership % | 48.50%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_BlackhawkMidstreamLlcMember |  |  |
Equity investments and investments in subsidiaries | 0 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_BlackhawkMidstreamLlcMember |  | 0 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_BlackhawkMidstreamLlcMember |
(Income) loss from equity method investments | (7,217)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_BlackhawkMidstreamLlcMember | (84,787)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_BlackhawkMidstreamLlcMember |  |
Stingray Logistics LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Approximate Ownership % | 0.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_StingrayLogisticsLlcMember |  |  |
Equity investments and investments in subsidiaries | 0 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_StingrayLogisticsLlcMember |  | 0 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_StingrayLogisticsLlcMember |
(Income) loss from equity method investments | 0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_StingrayLogisticsLlcMember | 81 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_StingrayLogisticsLlcMember |  |
Diamondback Energy, Inc [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Approximate Ownership % | 0.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember |  |  |
Equity investments and investments in subsidiaries | 0 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember |  | 0 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember | 138,500 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember
(Income) loss from equity method investments | 0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember | (48,767)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember |  |
Stingray Energy Services LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Approximate Ownership % | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_StingrayEnergyServicesLlcMember |  |  |
Equity investments and investments in subsidiaries | 6,167 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_StingrayEnergyServicesLlcMember |  | 5,718 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_StingrayEnergyServicesLlcMember |
(Income) loss from equity method investments | 10 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_StingrayEnergyServicesLlcMember | 41 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_StingrayEnergyServicesLlcMember |  |
Sturgeon Acquisitions LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Approximate Ownership % | 25.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_SturgeonAcquisitionsLLCMember |  | 25.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_SturgeonAcquisitionsLLCMember |
Equity investments and investments in subsidiaries | 22,258 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_SturgeonAcquisitionsLLCMember |  | 22,507 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_SturgeonAcquisitionsLLCMember |
(Income) loss from equity method investments | (568)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_SturgeonAcquisitionsLLCMember | 0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_SturgeonAcquisitionsLLCMember |  |
Mammoth Energy Partners LP [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Approximate Ownership % | 30.50%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_MammothEnergyPartnersLPMember |  | 30.50%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_MammothEnergyPartnersLPMember |
Equity investments and investments in subsidiaries | 143,807 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_MammothEnergyPartnersLPMember |  | 143,973 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_MammothEnergyPartnersLPMember |
(Income) loss from equity method investments | $ 2,372 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_MammothEnergyPartnersLPMember | $ 0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_MammothEnergyPartnersLPMember |  |

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