Derivative Instruments (Details 1) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2012
Interest rate swap agreements
Fair Value/ Carrying Amount Of Assets (Liability)	$ (159,702)
United states dollar-denominated interest rate swaps 1 [Member]
Interest rate swap agreements
Interest Rate Index	LIBOR
Principal Amount	417,666
Fair Value/ Carrying Amount Of Assets (Liability)	(130,811)
Weighted-Average Remaining Term (Years)	24 years 7 months 6 days
Fixed Interest Rate (%) (1)	4.90%
United states dollar denominated interest rate swaps 2 [Member]
Interest rate swap agreements
Interest Rate Index	LIBOR
Principal Amount	206,696
Fair Value/ Carrying Amount Of Assets (Liability)	(60,618)
Weighted-Average Remaining Term (Years)	6 years 8 months 12 days
Fixed Interest Rate (%) (1)	6.20%
United states dollar denominated interest rate swaps 3 [Member]
Interest rate swap agreements
Interest Rate Index	LIBOR
Principal Amount	90,000
Fair Value/ Carrying Amount Of Assets (Liability)	(19,111)
Weighted-Average Remaining Term (Years)	6 years 2 months 12 days
Fixed Interest Rate (%) (1)	4.90%
United states dollar denominated interest rate swaps 4 [Member]
Interest rate swap agreements
Interest Rate Index	LIBOR
Principal Amount	100,000
Fair Value/ Carrying Amount Of Assets (Liability)	(21,414)
Weighted-Average Remaining Term (Years)	4 years 6 months
Fixed Interest Rate (%) (1)	5.30%
United states dollar denominated interest rate swaps 5 [Member]
Interest rate swap agreements
Interest Rate Index	LIBOR
Principal Amount	212,500
Fair Value/ Carrying Amount Of Assets (Liability)	(59,119)
Weighted-Average Remaining Term (Years)	16 years 6 months
Fixed Interest Rate (%) (1)	5.20%
United states dollar denominated interest rate swaps 6 [Member]
Interest rate swap agreements
Interest Rate Index	LIBOR
Principal Amount	469,666
Fair Value/ Carrying Amount Of Assets (Liability)	166,527
Weighted-Average Remaining Term (Years)	24 years 7 months 6 days
Fixed Interest Rate (%) (1)	4.80%
Euro denominated interest rate swaps [Member]
Interest rate swap agreements
Interest Rate Index	EURIBOR
Principal Amount	334,312
Fair Value/ Carrying Amount Of Assets (Liability)	$ (35,156)
Weighted-Average Remaining Term (Years)	12 years
Fixed Interest Rate (%) (1)	3.10%

Monetary amount specified by the derivative(s). Expressed as an absolute value.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

+ Details

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Interest rate index

+ References

No definition available.

+ Details

Name:	tgp_InterestRateIndex
Namespace Prefix:	tgp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The average time remaining until maturity on the group of derivatives identified.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeAverageRemainingMaturity
Namespace Prefix:	us-gaap_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	instant

- Definition

Fair value as of the balance sheet date of the assets less the liabilities of a derivative or group of derivatives.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13495-108611

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611

+ Details

Name:	us-gaap_DerivativeFairValueOfDerivativeNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

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