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Segment Reporting - Reconciliation of Total Segment Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Total assets | $ 7,081,120 | $ 8,072,864
Segment Reconciling Items | Cash and cash equivalents |  |
Segment Reporting Information [Line Items] |  |
Total assets | 376,563 | 353,241
Segment Reconciling Items | Other assets not allocated |  |
Segment Reporting Information [Line Items] |  |
Total assets | 127,608 | 102,701
Eliminations |  |
Segment Reporting Information [Line Items] |  |
Total assets | (9,870) | (14,746)
Teekay LNG | Liquefied Gas Carriers | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total assets | 4,711,448 | 5,249,465
Teekay Tankers | Conventional Tankers | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total assets | 1,791,132 | 2,140,652
Teekay Parent | Corporate, Non-Segment |  |
Segment Reporting Information [Line Items] |  |
Total assets | 48,448 | 80,455
Teekay Parent | Offshore Production | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total assets | $ 35,791 | $ 161,096

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