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Segment Reporting - Other Income Statement Items by Segment (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and Amortization |  | $ (485,829) | $ (571,825) | $ (509,500)
Asset Impairments and Net Loss on Sale of Vessels, Equipment and Other Operating Assets |  | (270,743) | (112,246) | (70,175)
Equity (Loss) Income |  | (37,344) | 85,639 | 102,871
Eliminations and other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and Amortization |  | 0 | 0 | 690
Asset Impairments and Net Loss on Sale of Vessels, Equipment and Other Operating Assets |  | 0 | 0 | 0
Equity (Loss) Income |  | 0 | 0 | 0
Teekay Parent | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and Amortization |  | (60,397) | (72,123) | (71,909)
Asset Impairments and Net Loss on Sale of Vessels, Equipment and Other Operating Assets |  | (205,659) | (12,597) | (948)
Equity (Loss) Income |  | (31,330) | (2,281) | (500)
Teekay Parent | Offshore Production | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and Amortization |  | (60,560) | (70,855) | (69,508)
Asset Impairments and Net Loss on Sale of Vessels, Equipment and Other Operating Assets |  | (205,659) | (110) | (948)
Equity (Loss) Income |  | (7,861) | (575) | (12,196)
Teekay Parent | Conventional Tankers | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and Amortization |  | 0 | (1,717) | (2,852)
Asset Impairments and Net Loss on Sale of Vessels, Equipment and Other Operating Assets |  | 0 | (12,487) | 0
Equity (Loss) Income |  | (20,677) | 132 | 12,797
Teekay Parent | Other | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and Amortization |  | 163 | 449 | 451
Asset Impairments and Net Loss on Sale of Vessels, Equipment and Other Operating Assets |  | 0 | 0 | 0
Equity (Loss) Income |  | (2,792) | (1,838) | (1,101)
Teekay Offshore | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and Amortization |  | (219,406) | (300,011) | (274,599)
Asset Impairments and Net Loss on Sale of Vessels, Equipment and Other Operating Assets |  | (1,500) | (40,079) | (69,998)
Equity (Loss) Income | $ (2,461) | 12,028 | 17,933 | 7,672
Teekay LNG | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and Amortization |  | (105,545) | (95,542) | (92,253)
Asset Impairments and Net Loss on Sale of Vessels, Equipment and Other Operating Assets |  | (50,600) | (38,976) | 0
Equity (Loss) Income |  | 9,789 | 62,307 | 84,171
Teekay LNG | Liquefied Gas Carriers | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and Amortization |  | (95,025) | (80,084) | (71,323)
Asset Impairments and Net Loss on Sale of Vessels, Equipment and Other Operating Assets |  | 0 | 0 | 0
Equity (Loss) Income |  | 9,789 | 62,307 | 84,171
Teekay LNG | Conventional Tankers | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and Amortization |  | (10,520) | (15,458) | (20,930)
Asset Impairments and Net Loss on Sale of Vessels, Equipment and Other Operating Assets |  | (50,600) | (38,976) | 0
Equity (Loss) Income |  | 0 | 0 | 0
Teekay Tankers | Conventional Tankers | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Depreciation and Amortization |  | (100,481) | (104,149) | (71,429)
Asset Impairments and Net Loss on Sale of Vessels, Equipment and Other Operating Assets |  | (12,984) | (20,594) | 771
Equity (Loss) Income |  | $ (25,370) | $ 7,680 | $ 11,528

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