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Financial Instruments Narrative (Detail) |  | 1 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Sep. 25, 2017 day $ / shares $ / unit | Jul. 31, 2018 shares | Jan. 31, 2014 shares | Jun. 30, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($)
Derivative [Line Items] |  |  |  |  |
Available through exercise of stock purchase warrant (in shares) |  |  | 1,500,000.0 |  |
Teekay Offshore |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Class of warrant or right, exercise price of warrants (in USD per share) | $ / shares | $ 0.01 |  |  |  |
Common stock, threshold consecutive trading days | day | 10 |  |  |  |
Stock purchase warrants | Teekay Offshore |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Cap Price | $ / unit | 4.00 |  |  |  |
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 | $ |  |  |  |  | $ 1,300,000
Other Non-Current Assets | $ |  |  |  | $ 1,500,000 |
Teekay Offshore | Series D Warrant |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair value assumptions, weighted average volatility rate |  |  |  | 55.80% |
Teekay Offshore | Brookfield Transaction Warrants |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair value assumptions, weighted average volatility rate |  |  |  | 58.10% |
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) |  |  |  | 14,500,000 |
Brookfield Transaction | Teekay Offshore | Stock purchase warrants |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Other Non-Current Assets | $ |  |  |  | $ 33,800,000 | $ 29,400,000
Tanker Investments Limited | Stock purchase warrants |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Stock purchase warrants | $ |  |  |  | $ 0 |
Subsequent Event | Teekay Offshore |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Common Unit, Authorized |  | 1 |  |  |
Subsequent Event | Teekay Corporation | Stock purchase warrants | Brookfield |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Class of warrant or right, warrants issued (in shares) |  | 1,000,000 |  |  |
Subsequent Event | General Partner | Brookfield |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Members or limited partners, ownership interest |  | 2.00% |  |  |

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