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Capital Stock - Capital Stock (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 9 Months Ended
Mar. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Class of Stock [Line Items]        
Preferred stock, share authorized (in shares)   25,000,000   25,000,000
Preferred stock, par value (in usd per share)   $ 1   $ 1
Common stock, share authorized (in shares)   725,000,000   725,000,000
Common stock, par value (in usd per share)   $ 0.001   $ 0.001
Preferred stock, share issued (in shares)   0    
Net proceeds from equity issuances of subsidiaries   $ 0 $ 8,521  
Number of common shares or units issued related to the exercise of share based compensation during the period (in shares)   200,000    
Stock options granted (in shares)   1,048,916 732,314  
Stock option per share value (in usd per share)   $ 8.67 $ 10.18  
Restricted stock units        
Class of Stock [Line Items]        
Number of shares or units granted equity based compensation awards (in shares)   625,878 344,319  
Fair value of granted stock   $ 5,400 $ 3,500  
Vesting period   3 years    
Restricted stock awards        
Class of Stock [Line Items]        
Number of shares or units granted equity based compensation awards (in shares)   79,869 89,387  
Fair value of granted stock   $ 700 $ 900  
Stock option        
Class of Stock [Line Items]        
Stock option, term   10 years    
Vesting period   3 years    
Weighted-average grant-date fair value of options granted (in usd per share) $ 4.21      
Expected volatility used in computing fair value of options granted   64.80%    
Expected life used in computing fair value of options granted, years   5 years 6 months    
Dividend yield used in computing fair value of options granted   2.50%    
Risk-free interest rate used in computing fair value of options granted   2.60%    
Estimated forfeiture rate used in computing fair value of options granted   7.40%    
Period of historical data used to calculate expected volatility in years   5 years    
Teekay Parent | Common Stock        
Class of Stock [Line Items]        
Sale of stock, number of shares issued in transaction (in shares)   10,000,000    
Sale of stock, price per share (in USD per share)   $ 9.75    
Net proceeds from equity issuances of subsidiaries   $ 93,000    
Continuous Offering Program | Teekay Parent        
Class of Stock [Line Items]        
Sale of stock, number of shares issued in transaction (in shares)   1,100,000    
Sale of stock, consideration received per transaction   $ 10,700