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Segment Reporting - Reconciliation of Total Segment Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Total assets | $ 8,339,787 | $ 8,092,437
Segment Reconciling Items | Cash and cash equivalents |  |
Segment Reporting Information [Line Items] |  |
Total assets | 385,352 | 445,452
Segment Reconciling Items | Other assets not allocated |  |
Segment Reporting Information [Line Items] |  |
Total assets | 103,821 | 118,493
Eliminations |  |
Segment Reporting Information [Line Items] |  |
Total assets | (17,117) | (21,732)
Teekay LNG | Liquefied Gas Carriers | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total assets | 5,081,219 | 4,624,321
Teekay LNG | Conventional Tankers | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total assets | 67,244 | 112,844
Teekay Tankers | Conventional Tankers | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total assets | 2,074,833 | 2,125,909
Teekay Parent | Corporate, Non-Segment |  |
Segment Reporting Information [Line Items] |  |
Total assets | 35,592 | 26,527
Teekay Parent | Conventional Tankers | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total assets | 13,056 | 13,620
Teekay Parent | Offshore Production | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total assets | 335,948 | 366,229
Teekay Offshore | Offshore Production | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total assets | $ 259,839 | $ 280,774

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