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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, 2018 | Dec. 31, 2017 | Dec. 11, 2017 | Nov. 30, 2011
--- | --- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership interest | 100.00% |  |  |
Investments in subsidiaries | $ 1,288,444 | $ 1,335,123 |  |
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% |  | 50.00% |
Magnora |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership interest |  | 43.50% |  | 40.00%
Other |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership interest | 50.00% |  |  |
Investments in subsidiaries | $ 0 | $ 1,169 |  |
Teekay Parent |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investments in subsidiaries | $ 488,547 | 1,117,291 |  |
Teekay Parent | Magnora | Offshore Production | Operating Segments |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership interest | 44.00% |  |  |
Investments in subsidiaries | $ 0 | 15,589 |  |
Teekay Parent | Teekay Offshore | Operating Segments |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership interest | 14.00% |  |  |
Investments in subsidiaries | $ 157,924 | 208,871 |  |
Teekay Parent | TOO GP | Operating Segments |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership interest | 49.00% |  |  |
Investments in subsidiaries | $ 3,968 | 4,061 |  |
Teekay LNG | Bahrain LNG Joint Venture |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investments in subsidiaries | $ 79,100 | 79,100 |  |
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 | $ 81,709 | 77,786 |  |
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 | $ 210,290 | 194,715 |  |
Teekay LNG | Pan Union Joint Venture | Liquefied Gas Carriers | Operating Segments |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investments in subsidiaries | $ 71,040 | 38,298 |  |
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 | 49.00% |  |  |
Investments in subsidiaries | $ 32,419 | 79,915 |  |
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 | $ 151,186 | 157,926 |  |
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 | $ 342,280 | 335,897 |  |
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 | $ 79,606 | 73,316 |  |
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 | $ 132,256 | 123,034 |  |
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 | $ 25,766 | $ 24,546 |  |
Qatar Gas Transport Company Ltd | RasGas3 Joint Venture |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity method investment, ownership interest | 60.00% |  |  |

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