XML 15 R33.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Property And Equipment (Summary Of Oil And Gas Properties Not Subject To Amortization) (Details) (USD $) In Thousands, unless otherwise specified |  |  | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011 | Jun. 30, 2012 Minimum [Member] | Jun. 30, 2012 Maximum [Member] | Jun. 30, 2012 West Texas Permian | Jun. 30, 2012 Colorado | Jun. 30, 2012 Bakken | Jun. 30, 2012 Southern Louisiana | Jun. 30, 2012 Ohio | Jun. 30, 2012 Belize | Jun. 30, 2012 Other
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |  |  |  |  |  |  |  |  |  |
Anticipated Timing of Inclusion of Costs in Amortization Calculation |  |  | 3 years | 5 years |  |  |  |  |  |  |
Capitalized costs of oil and natural gas properties excluded from amortization | $ 199,598 | $ 138,623 |  |  | $ 15,033 | $ 5,697 | $ 300 | $ 709 | $ 172,103 | $ 5,711 | $ 45

X
- Definition Anticipated Timing of Inclusion of Costs in Amortization Calculation1 + References No definition available. + Details
Name: | gpor_AnticipatedTimingOfInclusionOfCostsInAmortizationCalculation1
Namespace Prefix: | gpor_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The sum of the capitalized costs incurred, as of the balance sheet date, of unproved properties excluded from amortization including acquisition costs, exploration costs, development costs, and production costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=6949603&loc=d3e511914-122862 + Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationCumulative
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration