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Total Capital and Net Income Per Unit - Incentive Distributions (Detail) | 12 Months Ended
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Dec. 31, 2012
Unitsholders [Member] |
Incentive Distribution Made to Managing Member or General Partner [Line Items] |
Minimum quarterly distribution of $0.4125 | 98.00%
Up to $0.4625 | 98.00%
Above $0.4625 up to $0.5375 | 85.00%
Above $0.5375 up to $0.65 | 75.00%
Above $0.65 | 50.00%
General Partner [Member] |
Incentive Distribution Made to Managing Member or General Partner [Line Items] |
Minimum quarterly distribution of $0.4125 | 2.00%
Up to $0.4625 | 2.00%
Above $0.4625 up to $0.5375 | 15.00%
Above $0.5375 up to $0.65 | 25.00%
Above $0.65 | 50.00%

X
- Definition Incentive distribution level five. + References No definition available. + Details
Name: | tgp_IncentiveDistributionLevelFive
Namespace Prefix: | tgp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Incentive distribution level four. + References No definition available. + Details
Name: | tgp_IncentiveDistributionLevelFour
Namespace Prefix: | tgp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Incentive distribution level one. + References No definition available. + Details
Name: | tgp_IncentiveDistributionLevelOne
Namespace Prefix: | tgp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Incentive distribution level three. + References No definition available. + Details
Name: | tgp_IncentiveDistributionLevelThree
Namespace Prefix: | tgp_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Incentive distribution level two. + References No definition available. + Details
Name: | tgp_IncentiveDistributionLevelTwo
Namespace Prefix: | tgp_
Data Type: | num:percentItemType
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