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Investments - Tanker Investments Ltd - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Nov. 27, 2017 | May 31, 2017 | Oct. 31, 2014 | Jan. 31, 2014 | Jun. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2017
Net Investment Income [Line Items] |  |  |  |  |  |  |
Equity method investment, ownership interest |  |  |  |  |  |  | 100.00%
Common Stock |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |
Issuance of equity private placement |  |  |  |  |  | $ 96.2 |
Tanker Investments Ltd. |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |
Percentage of ownership acquired | 8.20% |  |  |  |  |  |
Shares owned (in shares) |  | 2,500,000 |  |  |  |  |
Amount purchased for shares | $ 151.3 |  |  |  |  |  |
Business acquisition, share price (in USD per share) | $ 1.70 |  |  |  |  |  |
Tanker Investments Ltd. | Teekay Tankers |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |
Percentage of ownership acquired | 11.30% |  |  |  |  |  |
Number of shares acquiring (in shares) |  | 27,000,000 |  |  |  |  |
Shares owned (in shares) |  | 3,400,000 |  |  |  |  |
Other than temporary impairment |  |  |  |  | $ 48.6 |  |
Remeasurement gain | $ 2.4 |  |  |  |  |  |
Amount purchased for shares | $ 151.3 |  |  |  |  |  |
Business acquisition, share price (in USD per share) | $ 1.7 |  |  |  |  |  |
Transaction costs | $ 6.8 |  |  |  |  |  |
Total acquisition cost | 177.3 |  |  |  |  |  |
Liabilities assumed | 47.1 |  |  |  |  |  |
Long-term debt assumed | 337.1 |  |  |  |  |  |
Total vessels and equipment | 467.1 |  |  |  |  |  |
Existing time-charter contracts | $ 0.2 |  |  |  |  |  |
Tanker Investments Ltd. | Teekay Tankers | Class A |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |
Share exchange (in shares) |  | 3.3 |  |  |  |  |
Number of shares to be issued/exchanged (in shares) | 88,977,544 |  |  |  |  |  |
Tanker Investments Ltd. | Teekay Corporation | Class A |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |
Number of shares to be issued/exchanged (in shares) | 8,250,000 |  |  |  |  |  |
Tanker Investments Ltd. | Teekay and Teekay Tankers |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |
Equity method investment, ownership interest |  |  |  | 20.00% |  |  |
Issuance of equity private placement |  |  |  | $ 250.0 |  |  |
Equity method investment |  |  |  | $ 50.0 |  |  |
Tanker Investments Ltd. | Teekay and Teekay Tankers | Common Stock |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |
Purchase of common stock (in shares) |  |  |  | 5,000,000 |  |  |
Tanker Investments Ltd. | Teekay Tankers |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |
Percentage of ownership acquired |  |  | 2.43% |  |  |  |
Number of shares to be issued/exchanged (in shares) |  | 27,000,000 |  |  |  |  |
Tanker Investments Ltd. | Teekay Tankers | Common Stock |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |
Purchase of common stock (in shares) |  |  | 900,000 |  |  |  |

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