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Property And Equipment (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Property And Equipment [Abstract]
Cumulative capitalization of general and administrative costs incurred and capitalized to the full cost pool	$ 25,470,000
Capitalized general and administrative costs	$ 1,976,000	$ 1,377,000

X

- Definition

General and administrative costs capitalized to the full cost pool.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

X

- Definition

Cumulative capitalization of general and administrative costs incurred and capitalized to the full cost pool.

+ References

No definition available.

+ Details

Name:	gpor_CumulativeCapitalizationOfGeneralAndAdministrativeCostsIncurredAndCapitalizedToFullCostPool
Namespace Prefix:	gpor_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration