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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 | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 31, 2015 USD ($) Vessel $ / shares shares | Jul. 31, 2015 USD ($) $ / shares | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2015
Net Investment Income [Line Items] |  |  |  |  |  |  |  |
Equity income |  |  | $ 37,219 |  | $ 39,901 | $ 52,636 | $ 60,650 |
Ship-to-ship transfer business [Member] |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |
Joint venture ownership percentage |  |  |  |  |  |  |  | 50.00%
Equity income |  | $ 8,700 |  |  |  |  |  |
Ship-to-ship transfer business [Member] | Teekay Tankers [Member] |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |
Purchase price of acquisition | $ 47,300 |  |  |  |  |  |  |
Goodwill, purchase accounting adjustments |  |  |  | $ 8,100 |  |  |  |
Finite-lived intangible assets, purchase accounting adjustments |  |  |  | $ (8,400) |  |  |  |
Ship-to-ship transfer business [Member] | Working Capital [Member] | Teekay Tankers [Member] |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |
Purchase price of acquisition | $ 1,800 |  |  |  |  |  |  |
Ship-to-ship Support Vessel [Member] | Ship-to-ship transfer business [Member] | Teekay Tankers [Member] |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |
Number of vessels | Vessel | 6 |  |  |  |  |  |  |
Aframax Tanker [Member] | Ship-to-ship transfer business [Member] | Teekay Tankers [Member] |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |
Number of vessels | Vessel | 1 |  |  |  |  |  |  |
Teekay [Member] | Ship-to-ship transfer business [Member] | Teekay Tankers [Member] | Class B common stock [Member] |  |  |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |  |  |
Number of common stock issued | shares | 6.5 |  |  |  |  |  |  |
Shares issued, price per share (usd per share) | $ / shares | $ 6.99 | $ 6.99 |  |  |  |  |  |

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