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Total Capital and Net Income Per Unit - Incentive Distributions (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2012
Incentive Distribution Made to Managing Member or General Partner [Line Items] |
Minimum quarterly distribution | 0.4125
Minimum [Member] |
Incentive Distribution Made to Managing Member or General Partner [Line Items] |
Minimum quarterly distribution | 0.4125
Minimum [Member] | Up to $0.4625 [Member] |
Incentive Distribution Made to Managing Member or General Partner [Line Items] |
Exceeded cash distribution per unit | 0.4125
Minimum [Member] | Above $0.4625 up to $0.5375 [Member] |
Incentive Distribution Made to Managing Member or General Partner [Line Items] |
Exceeded cash distribution per unit | 0.4625
Minimum [Member] | Above $0.5375 up to $0.65 [Member] |
Incentive Distribution Made to Managing Member or General Partner [Line Items] |
Exceeded cash distribution per unit | 0.5375
Minimum [Member] | Above $0.65 [Member] |
Incentive Distribution Made to Managing Member or General Partner [Line Items] |
Exceeded cash distribution per unit | 0.6500
Maximum [Member] | Up to $0.4625 [Member] |
Incentive Distribution Made to Managing Member or General Partner [Line Items] |
Exceeded cash distribution per unit | 0.4625
Maximum [Member] | Above $0.4625 up to $0.5375 [Member] |
Incentive Distribution Made to Managing Member or General Partner [Line Items] |
Exceeded cash distribution per unit | 0.5375
Maximum [Member] | Above $0.5375 up to $0.65 [Member] |
Incentive Distribution Made to Managing Member or General Partner [Line Items] |
Exceeded cash distribution per unit | 0.6500

X
- Definition Exceeded cash distribution per unit. + References No definition available. + Details
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Namespace Prefix: | tgp_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum quarterly distribution of incentives per quarter. + References No definition available. + Details
Name: | tgp_IncentiveDistributionPaymentMadeAndMinimumDistributionLevel
Namespace Prefix: | tgp_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_IncentiveDistributionMadeToManagingMemberOrGeneralPartnerLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration