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Capital Stock - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 12 Months Ended
Apr. 30, 2019
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Class of Stock [Line Items]        
Preferred stock, shares authorized (in shares)   25,000,000 25,000,000 25,000,000
Preferred stock, par value (in dollars per share)   $ 1 $ 1 $ 1
Common stock, share authorized (in shares)   725,000,000 725,000,000 725,000,000
Common stock, par value (in dollars per share)   $ 0.001 $ 0.001 $ 0.001
Common stock, share issued (in shares)     101,108,886 100,784,422
Preferred stock, share issued (in shares)     0  
Teekay Parent [Member]        
Class of Stock [Line Items]        
Common stock, share issued (in shares)     101,108,886  
Continuous Offering Program        
Class of Stock [Line Items]        
Common stock, share issued (in shares)     0  
Sale of Stock, Offering Amount $ 65.0      
Teekay Parent | Continuous Offering Program        
Class of Stock [Line Items]        
Number of shares issued (in shares)   1,100,000    
Sale of Stock, Consideration Received Per Transaction   $ 10.7    
Common Stock | Teekay Parent        
Class of Stock [Line Items]        
Number of shares issued (in shares)   10,000,000.0    
Sale of stock (in dollars per share)   $ 9.75    
Net cash proceeds   $ 93.0