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Long-Term Debt - Additional Information - Revolvers (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
credit_facility
vessel
Dec. 31, 2018
USD ($)
credit_facility
vessel
Mar. 31, 2018
USD ($)
Debt Instrument [Line Items]      
Amount reduced under revolving credit facilities, 2020 $ 354,400,000    
Amount reduced under revolving credit facilities, 2021 315,700,000    
Amount reduced under revolving credit facilities, 2022 577,700,000    
Amount reduced under revolving credit facilities, 2023 1,113,300,000    
Amount reduced under revolving credit facilities, 2024 $ 453,200,000    
Revolving credit facility      
Debt Instrument [Line Items]      
Number of revolving credit facilities | credit_facility 2 2  
Revolving credit facilities borrowing capacity $ 513,200,000 $ 523,100,000 $ 125,000,000.0
Amount reduced under revolving credit facilities, 2020 73,600,000    
Amount reduced under revolving credit facilities, 2021 73,600,000    
Amount reduced under revolving credit facilities, 2022 103,600,000    
Amount reduced under revolving credit facilities, 2023 53,600,000    
Amount reduced under revolving credit facilities, 2024 $ 208,800,000    
Revolving credit facility | Partnership’s vessels, together with other related security      
Debt Instrument [Line Items]      
Number of vessels | vessel 17 19  
Revolving credit facility | Teekay Shuttle Tankers L.L.C.      
Debt Instrument [Line Items]      
Minimum liquidity (greater of) $ 35,000,000.0    
Maximum net debt to total capitalization ratio required to maintain (as a percent) 75.00%    
Revolving credit facility | Teekay Shuttle Tankers L.L.C. | Minimum      
Debt Instrument [Line Items]      
Minimum liquidity (percent) (greater of) 5.00%    
Revolving credit facility | Guaranteed by partnership and subsidiaries      
Debt Instrument [Line Items]      
Number of revolving credit facilities | credit_facility 1    
Minimum liquidity (greater of) $ 75,000,000.0    
Revolving credit facility | Guaranteed by partnership and subsidiaries | Minimum      
Debt Instrument [Line Items]      
Maturity period 6 months    
Minimum liquidity (percent) (greater of) 5.00%    
Revolving credit facility | Teekay Shuttle Tankers L.L.C.      
Debt Instrument [Line Items]      
Maturity period 6 months