Name:	glf_LineOfCreditFacilityCovenantMandatoryPrepaymentCashThreshold
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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Represents the market value of the vessels securing the credit facility as a percentage of outstanding unpaid loans which, if less than this percentage, will trigger a mandatory prepayment under the credit facility unless certain additional security is provided.

No definition available.

Name:	glf_LineOfCreditFacilityCovenantMandatoryPrepaymentMarketValueOfVesselsThresholdPercentageOfOutstandingUnpaidLoans
Namespace Prefix:	glf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the market value of the vessels securing the credit facility as a percentage of total commitments which, if less than this percentage, will trigger a mandatory prepayment under the credit facility unless certain additional security is provided.

No definition available.

Name:	glf_LineOfCreditFacilityCovenantMandatoryPrepaymentMarketValueOfVesselsThresholdPercentageOfTotalCommitments
Namespace Prefix:	glf_
Data Type:	num:percentItemType
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Period Type:	instant

Represents the required maximum capitalization ratio, as defined, under a line of credit facility.

No definition available.

Name:	glf_LineOfCreditFacilityCovenantMaximumCapitalizationRatio
Namespace Prefix:	glf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the minimum collateral to commitments ratio, as defined, required to be maintained under a line of credit facility.

No definition available.

Name:	glf_LineOfCreditFacilityCovenantMinimumCollateralToCommitmentsRatio
Namespace Prefix:	glf_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

Represents the minimum collateral to debt ratio, as defined, required to be maintained under a line of credit facility.

No definition available.

Name:	glf_LineOfCreditFacilityCovenantMinimumCollateralToDebtRatio
Namespace Prefix:	glf_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

Represents the minimum consolidated adjusted EBITDA required to be maintained under a line of credit facility.

No definition available.

Name:	glf_LineOfCreditFacilityCovenantMinimumConsolidatedAdjustedEBITDA
Namespace Prefix:	glf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the minimum consolidated interest coverage ratio, as defined, under the line of credit facility.

No definition available.

Name:	glf_LineOfCreditFacilityCovenantMinimumConsolidatedInterestCoverageRatio
Namespace Prefix:	glf_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

Represents the minimum liquidity under the terms of a financial covenant in connection with a line of credit facility.

No definition available.

Name:	glf_LineOfCreditFacilityCovenantMinimumLiquidity
Namespace Prefix:	glf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Represents the minimum ratio of adjusted EBITDA to interest expense under a line of credit facility.

No definition available.

Name:	glf_LineOfCreditFacilityCovenantMinimumRatioOfAdjustedEBITDAToInterestExpense
Namespace Prefix:	glf_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

Represents the debt instrument indebtedness amount associated with the cross-default provisions under a line of credit facility.

No definition available.

Name:	glf_LineOfCreditFacilityCrossDefaultProvisionsInstrumentsOfIndebtednessAmount
Namespace Prefix:	glf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the number of vessels pertaining to the providing of liens to be granted by the borrower on vessels provided as additional collateral under a line of credit facility.

No definition available.

Name:	glf_LineOfCreditFacilityLiensOnVesselsAsAdditionalCollateralNumberOfVessels
Namespace Prefix:	glf_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Represents the number of vessels by which the line of credit facility is secured.

No definition available.

Name:	glf_LineOfCreditFacilityNumberOfVesselsSecuringTheFacility
Namespace Prefix:	glf_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

Redemption price on the principal amount , stated in percentage.

No definition available.

Name:	glf_RedemptionPriceAsPercentageOfPrincipalAmountPremiumAndinterest
Namespace Prefix:	glf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 16
-Article 9

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Contractual interest rate for funds borrowed, under the debt agreement.

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_DeferredFinanceCostsNet
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of the cost of borrowed funds accounted for as interest expense for debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Name:	us-gaap_InterestExpenseDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 20, 22
-Article 5

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of the fee for available but unused credit capacity under the credit facility.

Name:	us-gaap_LineOfCreditFacilityCommitmentFeeAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

No definition available.

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

No definition available.

Name:	us-gaap_LongTermDebtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585

Name:	us-gaap_PaymentsOfDebtIssuanceCosts
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

Name:	us-gaap_UnamortizedDebtIssuanceExpense
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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Data Type:	na
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Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
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Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
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Data Type:	na
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Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	us-gaap_LineOfCreditFacilityAxis=glf_MulticurrencyCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	us-gaap_CreditFacilityAxis=glf_SwinglineLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	us-gaap_LongtermDebtTypeAxis=glf_SeniorNoteDue2022Member
Namespace Prefix:
Data Type:	na
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Name:	us-gaap_BalanceSheetLocationAxis=glf_DeferredCostsAndOtherAssetsMember
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Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
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