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Investments - Teekay Tankers - Ship - to - Ship Transfer Business - Additional Information (Detail) $ / shares in Units, $ in Thousands, shares in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2015 vessel $ / shares | Jul. 31, 2015 USD ($) $ / shares shares | Aug. 31, 2014 shares | Mar. 31, 2016 USD ($) | Nov. 30, 2013 vessel | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($)
Net Investment Income [Line Items] |  |  |  |  |  |  |  |
Number of vessels | vessel |  |  |  |  | 5 |  |  |
Joint venture ownership percentage |  |  |  |  |  | 100.00% | 17.62% |
Equity income |  |  |  |  |  | $ 85,639 | $ 102,871 | $ 128,114
Ship-to-Ship Transfer Business (SPT) [Member] | Teekay Tankers [Member] |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |
Purchase price of acquisition |  | $ 47,300 |  |  |  |  |  |
Number of vessels | vessel | 6 |  |  |  |  |  |  |
Increase in goodwill |  |  |  | $ 8,100 |  |  |  |
Decrease in intangible assets |  |  |  | $ 8,400 |  |  |  |
Joint venture ownership percentage |  |  |  |  |  |  |  | 50.00%
Equity income |  |  |  |  |  |  | $ 8,700 |
Ship-to-Ship Transfer Business (SPT) [Member] | Teekay Tankers [Member] | Class B [Member] |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |
Number of common stock issued (in shares) | shares |  |  | 6.5 |  |  |  | 6.5 |
Ship-to-Ship Transfer Business (SPT) [Member] | Working Capital [Member] | Class B [Member] |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |
Number of common stock issued (in shares) | shares |  | 6.5 |  |  |  |  |  |
Ship-to-Ship Transfer Business (SPT) [Member] | Working Capital [Member] | Teekay Tankers [Member] |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |
Purchase price of acquisition |  | $ 1,800 |  |  |  |  |  |
Ship-to-Ship Transfer Business (SPT) [Member] | Working Capital [Member] | Teekay Tankers [Member] | Class B [Member] |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |
Shares issued, price per share | $ / shares | $ 6.99 | $ 6.99 |  |  |  |  |  |
Aframax Tanker [Member] | Ship-to-Ship Transfer Business (SPT) [Member] | Teekay Tankers [Member] |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |
Number of vessels | vessel | 1 |  |  |  |  |  |  |

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