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Derivative Instruments - Interest Rate Swap Agreements (Parenthetical) (Detail) In Millions, unless otherwise specified	Dec. 31, 2012 USD ($)	Dec. 31, 2012 EUR (€)
Derivative [Line Items]
Minimum variable interest rate on Debt	0.30%	0.30%
Maximum variable interest rate on Debt	2.75%	2.75%
Reduced Principal amount denominated Interest rate swaps	$ 92.5	€ 70.1

X

- Definition

Reduced principal amount of euro denominated interest rate swaps.

+ References

No definition available.

+ Details

Name:	tgp_ReducedPrincipalAmountOfDenominatedInterestRateSwaps
Namespace Prefix:	tgp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

High end of the range of percentage points added to the reference rate to compute the variable rate on the group of interest rate derivatives.

+ References

No definition available.

+ Details

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

X

- Details

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

X

- Definition

Low end of the range of percentage points added to the reference rate to compute the variable rate on the group of interest rate derivatives.

+ References

No definition available.

+ Details

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