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Segment Reporting - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2012 Segment
Segment Reporting Information [Line Items]
Number of reportable segments	2
Liquefied Gas Segment [Member]
Segment Reporting Information [Line Items]
Number of LNG carriers	27
Number of LNG carriers included in joint ventures accounted for under the equity method	16
Number of LPG carriers	3
Number of Multigas carriers	2
Conventional Tankers [Member]
Segment Reporting Information [Line Items]
Number of crude oil tankers	10
Number of Handymax product tanker	1

X

- Definition

Number Of Carrier

+ References

No definition available.

+ Details

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

X

- Definition

Number of LNG carriers included in joint ventures accounted for under the equity method.

+ References

No definition available.

+ Details

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

X

- Definition

Number of crude oil tankers.

+ References

No definition available.

+ Details

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

X

- Definition

Number of Handymax product tanker.

+ References

No definition available.

+ Details

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

X

- Definition

Number of LPG carriers.

+ References

No definition available.

+ Details

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

X

- Definition

Number of Multigas carriers.

+ References

No definition available.

+ Details

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

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

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