Name:	glf_Note4LongTermDebtDetailsLineItems
Namespace Prefix:	glf_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The redemption price of notes expressed as a percentage of the principal amount premium and interest.

+ References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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-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

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: 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(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Definition

Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

+ References

No definition available.

+ Details

Name:	us-gaap_DebtIssuanceCosts
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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.

+ References

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 210.5-02.19(b),22(b))

-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 19, 22

-Article 5

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Balance Type:	credit
Period Type:	instant

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

Reference 2: 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)

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Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

-Article 5

Reference 6: 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

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

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.

+ References

No definition available.

+ Details

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Note 4 - Long-Term Debt (Details)			0 Months Ended	12 Months Ended				48 Months Ended	120 Months Ended					1 Months Ended							6 Months Ended
Note 4 - Long-Term Debt (Details)	Jun. 30, 2014 USD ($)	Dec. 31, 2013 USD ($)	Mar. 14, 2017 Scenario, Forecast [Member] Senior Notes Due 2022 [Member]	Mar. 12, 2021 Scenario, Forecast [Member] Senior Notes Due 2022 [Member]	Mar. 14, 2020 Scenario, Forecast [Member] Senior Notes Due 2022 [Member]	Mar. 14, 2019 Scenario, Forecast [Member] Senior Notes Due 2022 [Member]	Mar. 14, 2018 Scenario, Forecast [Member] Senior Notes Due 2022 [Member]	Mar. 14, 2017 Scenario, Forecast [Member] Senior Notes Due 2022 [Member]	Mar. 12, 2022 Scenario, Forecast [Member] Senior Notes Due 2022 [Member] USD ($)	Jun. 30, 2014 Senior Notes Due 2022 [Member] USD ($)	Dec. 31, 2013 Senior Notes Due 2022 [Member] USD ($)	Dec. 05, 2012 Senior Notes Due 2022 [Member] USD ($)	Mar. 12, 2012 Senior Notes Due 2022 [Member] USD ($)	Feb. 26, 2013 Multicurrency Credit Facility [Member] USD ($)	Jun. 30, 2014 Multicurrency Credit Facility [Member] USD ($)	Dec. 31, 2013 Multicurrency Credit Facility [Member] USD ($)	Jun. 30, 2013 Multicurrency Credit Facility [Member] USD ($)	Jun. 30, 2014 Norwegian Facility [Member] USD ($)	Jun. 30, 2013 Norwegian Facility [Member] USD ($)	Jun. 30, 2013 Norwegian Facility [Member] NOK	Jun. 30, 2014 Facility Agreement [Member] USD ($)
Note 4 - Long-Term Debt (Details) [Line Items]
Debt Instrument, Face Amount												$ 200,000,000	$ 300,000,000						$ 100,000,000	600,000,000
Debt Instrument, Interest Rate, Stated Percentage													6.375%
Redemption Price as Percentage of Principal Amount Premium and Interest				100.00%	101.063%	102.125%	103.188%	100.00%
Debt Instrument, Basis Spread on Variable Rate			0.50%
Debt Issuance Cost									12,700,000					2,700,000							1,300,000
Long-term Debt, Fair Value										521,200,000
Long-term Debt, Gross										500,800,000
Line of Credit Facility, Maximum Borrowing Capacity														150,000,000
Long-term Debt	$ 544,950,000	$ 500,000,000								$ 500,000,000	$ 500,000,000				$ 5,000,000	$ 0	$ 5,000,000	$ 39,950,000