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Financial Instruments Narrative (Detail) |  | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 25, 2017 day $ / shares | Jul. 31, 2018 shares | Jan. 31, 2014 shares | Sep. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2018 shares | Dec. 31, 2017 USD ($) $ / shares
Derivative [Line Items] |  |  |  |  |  |
Common stock, par value (in usd per share) | $ / shares |  |  |  | $ 0.001 |  | $ 0.001
Available through exercise of stock purchase warrant (in shares) |  |  | 1,500,000.0 |  |  |
Teekay Offshore |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Common Unit, Authorized |  | 1 |  |  |  |
Class of warrant or right, exercise price of warrants (in USD per share) | $ / shares | $ 0.01 |  |  |  |  |
Common stock, par value (in usd per share) | $ / shares | $ 4.00 |  |  |  |  |
Common stock, threshold consecutive trading days | day | 10 |  |  |  |  |
Series D Warrant |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Number of shares available through exercise of stock purchase warrant (in shares) |  |  |  | 1,755,000 |  |
Class of warrant or right, term |  |  |  | 7 years |  |
Series D Warrant | Teekay Offshore |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Stock purchase warrants | $ |  |  |  | $ 1,200,000 |  | $ 1,300,000
Teekay Offshore | Series B |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Class of warrant or right, exercise price of warrants (in USD per share) | $ / shares |  |  |  | $ 4.55 |  |
Teekay Corporation | Stock purchase warrants | Brookfield |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Number of shares available through exercise of stock purchase warrant (in shares) |  |  |  | 15,500,000 | 14,500,000 |
Class of warrant or right, warrants issued (in shares) |  | 1,000,000 |  |  |  |
General Partner | Brookfield |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Members or limited partners, ownership interest |  | 2.00% |  |  |  |
Brookfield Transaction | Teekay Offshore | Stock purchase warrants |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Warrants and rights outstanding | $ |  |  |  | $ 31,000,000 |  | $ 29,400,000
Tanker Investments Limited | Stock purchase warrants |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Stock purchase warrants | $ |  |  |  | $ 0 |  |
Measurement Input, Price Volatility | Teekay Offshore | Stock purchase warrants |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Warrants and rights outstanding, measurement input |  |  |  | 58.80% |  |
Measurement Input, Price Volatility | Teekay Offshore | Series D Warrant |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Warrants and rights outstanding, measurement input |  |  |  | 58.90% |  |

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