v2.4.0.6

Assets (Details 6) (USD $)	12 Months Ended			0 Months Ended
Assets (Details 6) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Mar. 15, 2012 North America
Acquired Finite-Lived Intangible Assets [Line Items]
Acquisition and processing costs	$ 180,174,000	$ 169,881,000
Less accumulated amortization	(157,718,000)	(128,369,000)
Multi-client data library, net	22,456,000	41,512,000
Impairment charges related to multi-client data library		2,400,000
Amortization expense related to multi-client data library	53,300,000	85,000,000	38,000,000
Multi-client seismic library revenues	83,000,000	119,500,000	71,100,000
Cash consideration for North American seismic data sold				10,000,000
Loss on sale of seismic data				$ 5,100,000
Time period to retain revenue for seismic data sold				5 years

The aggregate expense charged against earnings to allocate the cost of seismic surveys that are licensed to customers on a non-exclusive basis.

+ References

No definition available.

+ Details

Name:	gok_AmortizationOfMulticlientDataLibrary
Namespace Prefix:	gok_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the cash consideration per agreement for the seismic data sold by the entity.

+ References

No definition available.

+ Details

Name:	gok_CashConsiderationForSeismicDataSold
Namespace Prefix:	gok_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Impairment Of Multi-Client Data Library

+ References

No definition available.

+ Details

Name:	gok_ImpairmentOfMultiClientDataLibrary
Namespace Prefix:	gok_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Accumulated amount of amortization of seismic surveys that are licensed to customers on a non-exclusive basis.

+ References

No definition available.

+ Details

Name:	gok_MulticlientDataLibraryAccumulatedAmortization
Namespace Prefix:	gok_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Gross amount of capitalized multi-client seismic library costs associated with acquiring and processing seismic data, including depreciation of the assets used in production of the surveys.

+ References

No definition available.

+ Details

Name:	gok_MulticlientDataLibraryGross
Namespace Prefix:	gok_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying amount of seismic surveys that are licensed to customers on a non-exclusive basis. Costs associated with acquiring and processing the data are capitalized and charged to amortization in the period in which the sales occur, using the sales forecast method. A minimum straight-line amortization is recorded only if minimum amortization exceeds the cost of services calculated using the sales forecast method.

+ References

No definition available.

+ Details

Name:	gok_MulticlientDataLibraryNet
Namespace Prefix:	gok_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Revenue earned during the period relating to seismic surveys that are licensed to customers on a non-exclusive basis.

+ References

No definition available.

+ Details

Name:	gok_MulticlientDataLibraryRevenue
Namespace Prefix:	gok_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Time Period to Retain Revenue for Seismic Data Sold

+ References

No definition available.

+ Details

Name:	gok_TimePeriodToRetainRevenueForSeismicDataSold
Namespace Prefix:	gok_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Definition

Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value.

+ References

No definition available.

+ Details

Name:	us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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