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Segment Reporting - Operating Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | $ 55,082 | $ (189,846) | $ 75,508 | $ (59,955)
Teekay LNG | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | 46,998 | 10,322 | 82,645 | 86,271
Teekay LNG | Liquefied Gas Carriers | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | 51,581 | 44,902 | 105,571 | 128,281
Teekay LNG | Conventional Tankers | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | (4,583) | (34,580) | (22,926) | (42,010)
Teekay Tankers | Conventional Tankers | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | (2,166) | (13,734) | (24,002) | (1,406)
Teekay Parent |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | 10,250 | (226,818) | 16,865 | (291,880)
Teekay Parent | Corporate, Non-Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | (2,655) | 216 | (8,463) | (20,370)
Teekay Parent | Conventional Tankers | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | 0 | (3,077) | 0 | (8,524)
Teekay Parent | Offshore Production | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | 12,905 | (223,957) | 25,328 | (262,986)
Teekay Offshore | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income (Loss) | $ 0 | $ 40,384 | $ 0 | $ 147,060

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