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Write-down and Loss on Sales of Vessels Schedule of Impairment and Loss on Sale of Vessels, Equipment and Other Operating Assets (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) vessel | Sep. 30, 2020 USD ($) vessel | Mar. 31, 2020 vessel | Sep. 30, 2021 USD ($) vessel | Sep. 30, 2020 USD ($) vessel
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
(Write-down) and gain (loss) on sale of assets (note 13) | $ (697) | $ (66,273) |  | $ (88,098) | $ (171,548)
Teekay LNG | Liquefied Gas Segment | LNG Carriers [Member] |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Asset Impairment Charges |  |  |  | 0 | $ (45,000)
Number Of Vessels Impaired | vessel |  |  | 6 |  | 6
Number Of Vessels | vessel |  |  | 7 |  |
Teekay Tankers | Conventional Tankers | Aframax Tanker [Member] |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Asset Impairment Charges |  |  |  | $ (5,152) | $ 0
Number of Vessels Sold | vessel | 1 |  |  |  |
Number Of Vessels Impaired | vessel | 1 | 5 |  | 2 | 5
Gain (Loss) on Disposition of Assets | $ (216) | $ 0 |  |  |
Teekay Tankers | Conventional Tankers | Suezmax Tankers [Member] |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Asset Impairment Charges |  |  |  | $ (62,937) | $ 0
Number Of Vessels Impaired | vessel |  |  |  | 3 | 3
Gain (Loss) on Disposition of Assets |  |  |  | $ 0 | $ (2,627)
Teekay Tankers | Conventional Tankers | LR2 Tanker |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Asset Impairment Charges |  |  |  | $ (18,381) | 0
Number Of Vessels Impaired | vessel |  |  |  | 3 |
Teekay Tankers | Conventional Tankers | Aframax Tankers |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Asset Impairment Charges | (913) | (43,526) |  | $ (913) | (43,526)
Teekay Parent | Offshore Production | FPSO |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Asset Impairment Charges | 0 | $ (12,200) |  | 0 | $ (72,285)
Number Of Vessels Impaired | vessel |  | 1 |  |  | 2
Ship To Ship Transfer Business [Member] | Teekay Tankers | Conventional Tankers |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down |  |  |  | 0 | $ (3,081)
Operating Right Of Use Asset [Member] | Teekay Tankers | Conventional Tankers |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Asset Impairment Charges | 0 | $ (1,447) |  | (715) | (2,091)
Operating Right Of Use Asset [Member] | Teekay Parent | Other Segments |  |  |  |  |
Long Lived Assets Held-for-sale [Line Items] |  |  |  |  |
Asset Impairment Charges | $ 0 | $ (9,100) |  | $ 0 | $ (9,100)

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