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Asset Impairments and Vessel Sales - Equity (Loss) Income (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 6 Months Ended
May 31, 2017
Jan. 31, 2014
Jun. 30, 2017
Tanker Investments Limited      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership interest     8.20%
Tanker Investments Limited      
Schedule of Equity Method Investments [Line Items]      
Impairment     $ 48.6
Tanker Investments Limited | Common Stock      
Schedule of Equity Method Investments [Line Items]      
Number of shares owned (in shares)     2.5
Teekay Tankers | Tanker Investments Limited      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership interest     11.30%
Teekay Tankers | Tanker Investments Limited      
Schedule of Equity Method Investments [Line Items]      
Purchase of common stock (in shares) 27.0 5.0  
Equity method investment, ownership interest   20.00%  
Teekay Tankers | Tanker Investments Limited | Common Stock      
Schedule of Equity Method Investments [Line Items]      
Number of shares purchased (USD per share) $ 3.3    
Number of shares owned (in shares)     3.4