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Equity-accounted Investments - Condensed Summary of Company's Investments in and Advances to Joint Ventures (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 30, 2011
--- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership interest | 100.00% |  |
Investments in subsidiaries (note 1) | $ 1,335,123 | $ 1,299,854 |
Minimum |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership interest | 14.00% |  |
Maximum |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership interest | 52.00% |  |
Yamal LNG Joint Venture |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership interest | 50.00% |  |
Sevan |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership interest | 43.50% | 43.50% | 40.00%
Other |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership interest | 50.00% |  |
Investments in subsidiaries (note 1) | $ 1,169 | $ 2,802 |
Teekay Parent |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in subsidiaries (note 1) | $ 1,117,291 | 3,122,738 |
Teekay Parent | Tanker Investments Ltd. | Conventional Tankers | Operating Segments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership interest | 8.00% |  |
Investments in subsidiaries (note 1) | $ 0 | 36,699 |
Teekay Parent | Sevan | Offshore Production | Operating Segments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership interest | 44.00% |  |
Investments in subsidiaries (note 1) | $ 15,589 | 22,180 |
Teekay Parent | TOO GP (2) (note 3) | Operating Segments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership interest | 51.00% |  |
Investments in subsidiaries (note 1) | $ 4,061 | 0 |
Teekay Offshore | Libra Joint Venture | Operating Segments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership interest | 50.00% |  |
Investments in subsidiaries (note 1) | $ 0 | 69,972 |
Teekay Offshore | Itajai | Operating Segments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership interest | 50.00% |  |
Investments in subsidiaries (note 1) | $ 0 | 71,827 |
Teekay Offshore | Teekay Parent | Operating Segments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership interest | 14.00% |  |
Investments in subsidiaries (note 1) | $ 208,871 | 0 |
Teekay LNG | Angola LNG Carriers | Liquefied Gas Carriers | Operating Segments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership interest | 33.00% |  |
Investments in subsidiaries (note 1) | $ 73,316 | 63,673 |
Teekay LNG | Pan Union Joint Venture | Liquefied Gas Carriers | Operating Segments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in subsidiaries (note 1) | $ 38,298 | 33,594 |
Teekay LNG | Pan Union Joint Venture | Minimum | Liquefied Gas Carriers | Operating Segments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership interest | 20.00% |  |
Teekay LNG | Pan Union Joint Venture | Maximum | Liquefied Gas Carriers | Operating Segments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership interest | 30.00% |  |
Teekay LNG | Exmar LNG Joint Venture | Liquefied Gas Carriers | Operating Segments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership interest | 50.00% |  |
Investments in subsidiaries (note 1) | $ 79,915 | 79,577 |
Teekay LNG | Exmar LPG Joint Venture | Liquefied Gas Carriers | Operating Segments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership interest | 50.00% |  |
Investments in subsidiaries (note 1) | $ 157,926 | 165,064 |
Teekay LNG | RasGas3 Joint Venture |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership interest | 40.00% |  |
Teekay LNG | RasGas3 Joint Venture | Liquefied Gas Carriers | Operating Segments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership interest | 40.00% |  |
Investments in subsidiaries (note 1) | $ 123,034 | 173,037 |
Teekay LNG | Teekay LNG - Marubeni Joint Venture |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership interest | 52.00% |  |
Teekay LNG | Teekay LNG - Marubeni Joint Venture | Liquefied Gas Carriers | Operating Segments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership interest | 52.00% |  |
Investments in subsidiaries (note 1) | $ 335,897 | 294,764 |
Teekay LNG | Yamal LNG Joint Venture | Liquefied Gas Carriers | Operating Segments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership interest | 50.00% |  |
Investments in subsidiaries (note 1) | $ 194,715 | 152,927 |
Teekay LNG | Bahrain LNG Joint Venture |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in subsidiaries (note 1) | $ 79,100 | 62,900 |
Teekay LNG | Bahrain LNG Joint Venture | Liquefied Gas Carriers | Operating Segments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership interest | 30.00% |  |
Investments in subsidiaries (note 1) | $ 77,786 | 64,003 |
Teekay Tankers | Tanker Investments Ltd. | Conventional Tankers | Operating Segments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership interest | 11.00% |  |
Investments in subsidiaries (note 1) | $ 0 | 47,710 |
Teekay Tankers | Wah Kwong Joint Venture | Conventional Tankers | Operating Segments |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity method investment, ownership interest | 50.00% |  |
Investments in subsidiaries (note 1) | $ 24,546 | $ 22,025 |

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