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Acquisitions (Details) (USD $)
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3 Months Ended | 0 Months Ended | ||
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Mar. 31, 2015
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Mar. 31, 2014
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Mar. 20, 2014
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Feb. 28, 2014
acre
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| Business Acquisition [Line Items] | ||||
| Net revenues | $ 176,317,000us-gaap_Revenues | $ 118,029,000us-gaap_Revenues | ||
| Lease operating expenses | 16,980,000us-gaap_LeaseOperatingExpense | 11,629,000us-gaap_LeaseOperatingExpense | ||
| Utica Shale [Member] | ||||
| Business Acquisition [Line Items] | ||||
| Gas and oil acreage, undeveloped, net |
8,000us-gaap_GasAndOilAreaUndevelopedNet / us-gaap_BusinessAcquisitionAxis = gpor_UticaShaleMember |
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| Purchase price |
182,000,000us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = gpor_UticaShaleMember |
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| Cash, net of purchase price adjustments |
179,527,000gpor_PaymenttoAcquireOilandGasPropertyandEquipmentNet / us-gaap_BusinessAcquisitionAxis = gpor_UticaShaleMember |
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| Fair value of net identifiable assets acquired |
179,527,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = gpor_UticaShaleMember |
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| Utica Shale [Member] | Proved Properties [Member] | ||||
| Business Acquisition [Line Items] | ||||
| Fair value of net identifiable assets acquired |
31,961,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = gpor_UticaShaleMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = gpor_ProvedPropertiesMember |
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| Utica Shale [Member] | Unproved Properties [Member] | ||||
| Business Acquisition [Line Items] | ||||
| Fair value of net identifiable assets acquired |
6,263,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = gpor_UticaShaleMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = gpor_UnprovedPropertiesMember |
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| Utica Shale [Member] | Unevaluated Properties [Member] | ||||
| Business Acquisition [Line Items] | ||||
| Fair value of net identifiable assets acquired |
$ 141,303,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = gpor_UticaShaleMember / us-gaap_PropertyPlantAndEquipmentByTypeAxis = gpor_UnevaluatedPropertiesMember |
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| X | ||||||||||
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- Definition
Payment to Acquire Oil and Gas Property and Equipment, Net No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of property, plant, and equipment recognized as of the acquisition date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Fractional interest owned based on working interests or other economic arrangements of lease area on which wells have not been drilled or completed to a point that would permit the production of commercial quantities of oil and gas regardless of whether or not such area contains proved reserves. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of lease operating expense related to property used in oil and gas production. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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