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Total Capital and Net Income Per Common Unit - Issuances of Common Units (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Oct. 23, 2017
Oct. 31, 2017
Dec. 31, 2017
Capital Unit [Line Items]      
Proceeds from equity offerings (note 16)     $ 164,411
Preferred      
Capital Unit [Line Items]      
Units Issued   6,800,000  
Offering Price (USD per unit)   $ 25.00  
Gross Proceeds   $ 170,000  
Proceeds from equity offerings (note 16)   $ 164,411  
Teekay Corporation's Ownership After the Offering (as a percent)   33.02%  
Series B Preferred Units      
Capital Unit [Line Items]      
Dividend rate, percentage 8.50%    
Liquidation preference (USD per unit) $ 25.00    
Redemption price (USD per unit) $ 25.00    
Series B Preferred Units | LIBOR      
Capital Unit [Line Items]      
Basis spread on variable rate (as a percent) 6.241%