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Asset Impairments and Loss on Sales of Vessels, Equipment and Other Operating Assets - Net (Loss) Gain on Sale of Vessels, Equipment and Other Operating Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Net loss on sale of vessels, equipment and other operating assets (note 18b) $ (38,084) $ (66,450) $ (2,431)
Other      
Property, Plant and Equipment [Line Items]      
Net loss on sale of vessels, equipment and other operating assets (note 18b) (29) 48 (177)
Teekay Parent | Conventional Tankers | VLCC      
Property, Plant and Equipment [Line Items]      
Net loss on sale of vessels, equipment and other operating assets (note 18b) 0 (12,495) 0
Teekay Offshore | Offshore Logistics | FSO      
Property, Plant and Equipment [Line Items]      
Net loss on sale of vessels, equipment and other operating assets (note 18b) 0 (983) 0
Teekay Offshore | Offshore Logistics | 2 Shuttle Tankers      
Property, Plant and Equipment [Line Items]      
Net loss on sale of vessels, equipment and other operating assets (note 18b) 0 6,817 1,643
Teekay Offshore | Offshore Logistics | 2 Conventional Tankers      
Property, Plant and Equipment [Line Items]      
Net loss on sale of vessels, equipment and other operating assets (note 18b) 0 65 (3,897)
Teekay LNG | Conventional Tankers | Suezmax      
Property, Plant and Equipment [Line Items]      
Net loss on sale of vessels, equipment and other operating assets (note 18b) (25,100) 0 0
Teekay LNG | Conventional Tankers | Suezmaxes Tankers Two      
Property, Plant and Equipment [Line Items]      
Net loss on sale of vessels, equipment and other operating assets (note 18b) 0 (11,537) 0
Teekay LNG | Conventional Tankers | Suezmaxes Tankers Three      
Property, Plant and Equipment [Line Items]      
Net loss on sale of vessels, equipment and other operating assets (note 18b) 0 (27,439) 0
Teekay Tankers | Conventional Tankers | Suezmax      
Property, Plant and Equipment [Line Items]      
Net loss on sale of vessels, equipment and other operating assets (note 18b) (1,797) (6,276) 0
Teekay Tankers | Conventional Tankers | Aframax Tanker      
Property, Plant and Equipment [Line Items]      
Net loss on sale of vessels, equipment and other operating assets (note 18b) (11,158)    
Teekay Tankers | Conventional Tankers | MR Tanker      
Property, Plant and Equipment [Line Items]      
Net loss on sale of vessels, equipment and other operating assets (note 18b) $ 0 $ (14,650) $ 0