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Operating Leases - Charters-in (Detail)
$ in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
vessel
ExtensionOption
Sep. 30, 2020
vessel
Dec. 31, 2020
USD ($)
vessel
Dec. 31, 2019
USD ($)
Property Subject to or Available for Operating Lease [Line Items]        
Operating Lease, Right-of-Use Asset $ 52,961   $ 52,961 $ 159,638
Short-term Lease, Cost     6,300  
Lessee, Operating Lease, Liability, Payments, Due 77,693   77,693  
Shuttle Tankers        
Property Subject to or Available for Operating Lease [Line Items]        
Operating Lease, Right-of-Use Asset 50,700   50,700  
Operating Lease, Liability $ 50,700   $ 50,700  
Teekay Tankers        
Property Subject to or Available for Operating Lease [Line Items]        
Number Of Vessels Chartered In | vessel   3    
Lessor, Operating Lease, Option to Extend     one  
Number of extension options for future lease | ExtensionOption 3      
Charter Contract Extension, Period, Future Lease 1 year      
Teekay Tankers | LR2 Tanker        
Property Subject to or Available for Operating Lease [Line Items]        
Operating Lease, Right-of-Use Asset $ 800   $ 800  
Number Of Vessels Chartered In | vessel     1  
Lessee, Operating Lease, Term of Contract 24 months   24 months  
Operating Lease, Liability $ 800   $ 800  
Teekay Tankers | Aframax Tanker [Member]        
Property Subject to or Available for Operating Lease [Line Items]        
Number Of Vessels To Be Chartered In | vessel 1   1  
Lessee, Future Operating Lease, Term of Contract     7 years  
Time Charter and Bare-boat Expenses [Member]        
Property Subject to or Available for Operating Lease [Line Items]        
Operating Lease, Expense     $ 73,800  
Operating Lease, Weighted Average Remaining Lease Term 2 years 4 months 24 days   2 years 4 months 24 days  
Operating Lease, Weighted Average Discount Rate, Percent 5.60%   5.60%  
Lease Component [Member] | Time Charter and Bare-boat Expenses [Member]        
Property Subject to or Available for Operating Lease [Line Items]        
Operating Lease, Expense     $ 48,500  
Lease [Member]        
Property Subject to or Available for Operating Lease [Line Items]        
Operating Lease, Liability $ 54,290   54,290  
Lessee, Operating Lease, Liability, Payments, Due 58,959   58,959  
Non-lease Component [Member]        
Property Subject to or Available for Operating Lease [Line Items]        
Lessee, Operating Lease, Liability, Payments, Due $ 18,734   18,734  
Non-lease Component [Member] | Time Charter and Bare-boat Expenses [Member]        
Property Subject to or Available for Operating Lease [Line Items]        
Operating Lease, Expense     $ 25,300