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ASSET UNDER DEVELOPMENT - Schedule of gain on disposal for LNG Croatia (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Sale Leaseback Transaction [Line Items]
Cash consideration received	$ 190,131	$ 3,160	$ 0
Carrying value of converted FSRU, LNG Croatia	(658,247)	(434,248)	(20,000)
Gain on disposal of long lived asset	5,682	$ 0	$ 0
LNG Croatia
Sale Leaseback Transaction [Line Items]
Cash consideration received	193,291
Carrying value of converted FSRU, LNG Croatia	(187,609)
Gain on disposal of long lived asset	$ 5,682

X

- Definition

Assets Under Development

+ References

No definition available.

+ Details

Name:	glng_AssetsUnderDevelopment
Namespace Prefix:	glng_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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

X

- Definition

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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- Details

Name:	us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=glng_LNGCroatiaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: