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Segment Reporting - Narrative (Detail) $ in Thousands |  | 3 Months Ended | 4 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
May 08, 2019 USD ($) | Sep. 30, 2020 USD ($) subsidiary | Sep. 30, 2019 USD ($) | May 08, 2019 USD ($) | Sep. 30, 2020 USD ($) subsidiary segment | Sep. 30, 2019 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  | 3 |
Equity income (loss) |  | $ 24,392 | $ 21,514 |  | $ 62,048 | $ (46,423)
Teekay Offshore [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Equity income (loss) |  |  |  | $ 3,100 |  |
Equity Method Investment, Other than Temporary Impairment |  |  |  |  |  | 64,900
Equity Method Investment, Realized Gain (Loss) on Disposal | $ 8,900 |  |  |  |  |
Teekay Offshore [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Equity Method Investment, Other than Temporary Impairment |  |  |  |  |  | 64,900
Equity Method Investment, Realized Gain (Loss) on Disposal |  |  |  |  |  | $ 8,900
Subsidiaries |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Number of Subsidiaries | subsidiary |  | 2 |  |  | 2 |

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