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Investments - Tanker Investments Ltd - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014
Net Investment Income [Line Items] |  |  |
Derivatives not designated as a cash flow hedge |  | $ 17,844 | $ 14,415
Preferred stock, share issued |  | 0 | 0
Percentage of combined ownership interest |  | 17.62% |
Tanker Investments Limited [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Preferred stock, voting rights |  | Elect one board member |
Tanker Investments Limited [Member] | Warrant [Member] | Derivatives Not Designated as a Cash Flow Hedge [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Derivatives not designated as a cash flow hedge |  | $ 10,300 |
Tanker Investments Limited [Member] | Series A- One Preferred Stock [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Preferred stock, share issued | 1 |  |
Tanker Investments Limited [Member] | Series A- Two Preferred Stock [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Preferred stock, share issued | 1 |  |
Teekay Tankers [Member] | Tanker Investments Limited [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Percentage of combined ownership interest | 20.00% |  |
Teekay Tankers [Member] | Tanker Investments Limited [Member] | Warrant [Member] | Maximum [Member] |  |  |
Net Investment Income [Line Items] |  |  |
Number of shares available through exercise of stock purchase warrant | 1,500,000 |  |

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