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Represents the debt to capital ratio that is required to maintain under the terms of a financial covenant in connection with a debt instrument.

No definition available.

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Represents the leverage ratio that is required to maintain under the terms of a financial covenant in connection with a debt instrument.

No definition available.

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Represents the minimum cash that is required to maintain under the terms of a financial covenant in connection with a debt instrument.

No definition available.

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Represents the minimum liquidity under the terms of a financial covenant in connection with a debt instrument.

No definition available.

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Represents the prepayment premium percentage under debt instrument agreement.

No definition available.

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Represents the percentage of total debt issuance costs.

No definition available.

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Represents the amount of decrease in semiannual payments under line of credit facility agreement.

No definition available.

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

No definition available.

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The maximum percent of common stock allowable to non-U.S. Citizens under The Jones Act.

No definition available.

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The aggregate percent of reorganized equity issued to noteholders.

No definition available.

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Represents number of common stock shares issued under reorganized equity transaction.

No definition available.

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Represents the exercise price of noteholder warrants to acquire common stock under reorganized equity transaction.

No definition available.

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Represents number of noteholder warrants issued under reorganized equity transaction.

No definition available.

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

No definition available.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Face (par) amount of debt instrument at time of issuance.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Contractual interest rate for funds borrowed, under the debt agreement.

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Face (par) amount of the original debt instrument that was repurchased.

No definition available.

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Balance Type:	debit
Period Type:	instant

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

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Amount, after accumulated amortization, of debt premium.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount, after accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of net gain (loss) on settlement of other claims for entities in bankruptcy, reported as a reorganization item.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of gain (loss) from the difference between the repurchase price of a debt instrument initially issued by the entity and the net carrying amount of the debt at the time of its repurchase.

No definition available.

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

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Name:	us-gaap_InterestExpense
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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.

Name:	us-gaap_LineOfCredit
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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.

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

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Name:	us-gaap_LongTermDebt
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Data Type:	xbrli:monetaryItemType
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Weighted average interest rate of long-term debt outstanding calculated at point in time.

No definition available.

Name:	us-gaap_LongtermDebtWeightedAverageInterestRate
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Data Type:	num:percentItemType
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Name:	us-gaap_LongtermDebtTypeAxis=glf_TermLoanMember
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Name:	us-gaap_DebtInstrumentAxis=glf_CreditFacilityAgreementMember
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Data Type:	na
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Data Type:	na
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