XML 14 R46.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Commitments And Contingencies (Details) (USD $) | 0 Months Ended |  |  | 0 Months Ended | 36 Months Ended |  |  | 0 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 11, 1997 wells Y | Jun. 30, 2012 wells | Dec. 31, 2011 | Apr. 20, 2009 Louisiana Department of Revenue Tax Litigation [Member] | Dec. 31, 2007 Louisiana Department of Revenue Tax Litigation [Member] | Dec. 31, 2010 Louisiana Department of Revenue Tax Litigation [Member] lawsuit | Nov. 30, 2006 Cudd Pressure Control Litigation [Member] defendant | Jul. 05, 2012 Cudd Pressure Control Litigation [Member] Royalty Fee [Member] | Jul. 05, 2012 Cudd Pressure Control Litigation [Member] Minimum [Member] Attorney Fees [Member] | Jul. 30, 2012 Reed Litigation [Member] defendant | Dec. 07, 2010 Reed Litigation [Member] defendant plaintiff acre | Jul. 30, 2012 Reed Litigation [Member] Individual [Member] plaintiff | Jul. 30, 2012 Reed Litigation [Member] Limited Liability Company [Member] plaintiff
Commitments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest in WCBB | 50.00% |  |  |  |  |  |  |  |  |  |  |  |
Contribution to plugging and abandonment trust per month | $ 18,000 |  |  |  |  |  |  |  |  |  |  |  |
Annual minimum wells to be plugged | 20 |  |  |  |  |  |  |  |  |  |  |  |
Tenure of minimum wells to be plugged, years | 20 |  |  |  |  |  |  |  |  |  |  |  |
Number of wells plugged |  | 354 |  |  |  |  |  |  |  |  |  |  |
Plugging and abandonment escrow account on the WCBB properties (Note 10) |  | 3,113,000 | 3,121,000 |  |  |  |  |  |  |  |  |  |
Alleged severance tax underpayment |  |  |  |  | 1,800,000 |  |  |  |  |  |  |  |
Lawsuits filed value |  |  |  | $ 2,275,729 |  |  |  | $ 11,800,000 | $ 450,000 |  |  |  |
Loss Contingency, Pending Claims, Number |  |  |  |  |  | 2 |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Percentage of Final Judgement |  |  |  |  |  |  |  |  | 10.00% |  |  |  |
Loss Contingencies, Number of Plaintiffs |  |  |  |  |  |  |  |  |  |  | 4 | 6 | 1
Loss Contingency, Increase (Decrease) Number of Defendants |  |  |  |  |  |  |  |  |  |  | 6 |  |
Loss Contingency, Number of Defendants |  |  |  |  |  |  | 6 |  |  | 15 | 21 |  |
Original number of acreage in litigation |  |  |  |  |  |  |  |  |  |  | 240 |  |
Amended number of acreage in litigation |  |  |  |  |  |  |  |  |  |  | 1,700 |  |

X
- Definition Alleged severance tax underpayment by the Louisiana Department of Revenue due to fixed price contracts + References No definition available. + Details
Name: | gpor_AllegedSeveranceTaxesUnderpayment
Namespace Prefix: | gpor_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amended number of acreage in litigation + References No definition available. + Details
Name: | gpor_AmendedNumberOfAcreageInLitigation
Namespace Prefix: | gpor_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Loss Contingency, Number of Plaintiffs + References No definition available. + Details
Name: | gpor_LossContingenciesNumberOfPlaintiffs
Namespace Prefix: | gpor_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loss Contingency, Damages Sought, Percentage of Final Judgement + References No definition available. + Details
Name: | gpor_LossContingencyDamagesSoughtPercentageOfFinalJudgement
Namespace Prefix: | gpor_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loss Contingency, Increase (Decrease) Number of Defendants + References No definition available. + Details
Name: | gpor_LossContingencyIncreaseDecreaseNumberOfDefendants
Namespace Prefix: | gpor_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of defendants named in a legal action. + References No definition available. + Details
Name: | gpor_LossContingencyNumberOfDefendants
Namespace Prefix: | gpor_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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 Original number of acreage in litigation + References No definition available. + Details
Name: | gpor_OriginalNumberOfAcreageInLitigation
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:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14557-108349 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_LossContingencyDamagesSoughtValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total amount of pending claims pertaining to a loss contingency accrual as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9, 10, 11, 12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_LossContingencyPendingClaimsNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant