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Operating Leases - Charters-in (Detail) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 27, 2020 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) vessel ExtensionOption | Dec. 31, 2021 USD ($) 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 |  |  | $ 32,211 | $ 14,257 | $ 32,211 |
Time-charter hire expenses (note 13) |  |  |  | (15,440) | (56,719) | $ (98,767)
Short-term Lease, Cost |  |  |  | 2,500 |  |
Lessee, Operating Lease, Liability, Payments, Due |  |  |  | $ 34,479 |  |
Fso [Member] |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Right-of-use Asset, Amount derecognized |  | $ 29,700 |  |  |  |
Right-of-use liability, Amount derecognized |  | $ 29,500 |  |  |  |
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 |
Right-of-use Asset, Amount derecognized | $ 50,700 |  |  |  |  |
Right-of-use liability, Amount derecognized | $ 50,700 |  |  |  |  |
Teekay Tankers |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Number Of Vessels Chartered In | vessel |  |  |  | 5 |  |
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] |  |  |  |  |  |
Number Of Vessels Chartered In | vessel |  |  |  | 1 |  |
Teekay Tankers | Aframax Tanker [Member] |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Number Of Vessels Chartered In | vessel |  |  |  | 2 |  |
Number Of Vessels To Be Chartered In | vessel |  |  | 1 | 1 | 1 |
Lessee, Future Operating Lease, Term of Contract |  |  |  | 7 years | 7 years |
Teekay Tankers | Lightering Support Vessel |  |  |  |  |  |
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 | 1 |
Lessee, Operating Lease, Term of Contract |  |  | 24 months |  | 24 months |
Operating Lease, Liability |  |  | $ 800 |  | $ 800 |
Teekay Tankers | LR2 Vessel, Aframax Tankers and Lightering Support Vessel |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  | $ 16,400 |  |
Lessee, Operating Lease, Term of Contract |  |  | 24 months |  | 24 months |
Operating Lease, Liability |  |  |  | 16,400 |  |
Time Charter Expenses |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Time-charter hire expenses (note 13) |  |  |  | $ (12,900) |  |
Operating Lease, Weighted Average Remaining Lease Term |  |  |  | 1 year 6 months |  |
Operating Lease, Weighted Average Discount Rate, Percent |  |  |  | 4.30% |  |
Lease Component [Member] | Time Charter Expenses |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Time-charter hire expenses (note 13) |  |  |  | $ (5,500) |  |
Lease [Member] |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Operating Lease, Liability |  |  |  | 14,257 |  |
Lessee, Operating Lease, Liability, Payments, Due |  |  |  | 14,772 |  |
Non-lease Component [Member] |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Lessee, Operating Lease, Liability, Payments, Due |  |  |  | 19,707 |  |
Non-lease Component [Member] | Time Charter Expenses |  |  |  |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |  |  |  |
Time-charter hire expenses (note 13) |  |  |  | $ (7,400) |  |

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