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Segment Reporting - Reconciliation of Total Segment Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Total assets | $ 8,092,437 | $ 12,814,752
Segment Reconciling Items | Cash and cash equivalents |  |
Segment Reporting Information [Line Items] |  |
Total assets | 445,452 | 567,994
Segment Reconciling Items | Other assets not allocated |  |
Segment Reporting Information [Line Items] |  |
Total assets | 118,493 | 281,244
Consolidation, Eliminations |  |
Segment Reporting Information [Line Items] |  |
Total assets | (21,732) | (114,549)
Teekay Parent |  |
Segment Reporting Information [Line Items] |  |
Total assets | 1,877,450 | 3,922,309
Teekay Parent | Conventional Tankers | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total assets | 13,620 | 55,937
Teekay Parent | Offshore Production | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total assets | 366,229 | 635,364
Teekay Parent | Other | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total assets | 26,527 | 13,208
Teekay Offshore | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total assets | 280,774 | 5,354,702
Teekay LNG | Liquefied Gas Carriers | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total assets | 4,624,321 | 3,957,088
Teekay LNG | Conventional Tankers | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total assets | 112,844 | 193,553
Teekay Tankers | Conventional Tankers | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Total assets | $ 2,125,909 | $ 1,870,211

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