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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