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Document and Entity Information
 12 Months Ended
Dec. 31, 2011
Document and Entity Information [Abstract]  
Entity Registrant Name Teekay LNG Partners L.P.
Entity Central Index Key 0001308106
Document Type 20-F
Document Period End Date Dec. 31, 2011
Amendment Flag false
Document Fiscal Year Focus 2011
Document Fiscal Period Focus FY
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer Yes
Entity Current Reporting Status Yes
Entity Filer Category Large Accelerated Filer
Entity Common Units 64,857,900