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(Loss) Earnings Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
May 31, 2017
Earnings Per Share [Line Items]          
Net loss $ (27,413) $ (37,477) $ (46,566) $ (33,764)  
Weighted average number of common shares – basic (shares) 268,558,556 179,197,658 268,426,201 178,665,430  
Dilutive effect of stock-based awards (shares) 0 0 0 0  
Weighted average number of common shares – diluted (shares) 268,558,556 179,197,658 268,426,201 178,665,430  
Loss per common share:          
– Basic (usd per share) $ (0.10) $ (0.21) $ (0.17) $ (0.19)  
– Diluted (usd per share) $ (0.10) $ (0.21) $ (0.17) $ (0.19)  
Teekay Tanker Operations Limited          
Loss per common share:          
Percentage of voting interests acquired         50.00%