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Basis of Presentation Narrative (Details)	Mar. 31, 2020 vessel
LPG Carriers [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Number Of Vessels	6

X

- Definition

Number Of Vessels

+ References

No definition available.

+ Details

Name:	tgp_NumberOfVessels
Namespace Prefix:	tgp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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

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

X

- Details

Name:	us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis=tgp_LPGCarriersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: