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Commitments and Contingencies - Additional Information - Redeemable Non-Controlling Interest (Detail) - $ / shares
1 Months Ended 12 Months Ended
Jul. 31, 2015
Jun. 30, 2016
Jul. 31, 2015
Dec. 31, 2017
Sep. 25, 2017
Series C Preferred Stock          
Redeemable Noncontrolling Interest [Line Items]          
Period for optional conversion to common units     3 years    
Teekay Offshore | Series C Preferred Stock          
Redeemable Noncontrolling Interest [Line Items]          
Public offering made by Partnership (in shares)     10,400,000    
Preferred units dividend rate     8.60%    
Conversion period   18 months 18 months    
Shares issued upon conversion 1   1    
Weighted average price of common units (dollars per share) $ 35.925        
Teekay Offshore | Series C-1 Preferred Units          
Redeemable Noncontrolling Interest [Line Items]          
Preferred units dividend rate       8.60%  
Shares issued upon conversion   1.474      
Period for optional conversion to common units   3 years      
Conversion of convertible securities (in shares)   8,500,000      
Percent of issuance price   150.00%      
Issuance price (in dollars per share)   $ 16.25      
Redemption price (USD per unit)         $ 18.2
Teekay Offshore | Series D Preferred Stock          
Redeemable Noncontrolling Interest [Line Items]          
Preferred units dividend rate   10.50%   10.50%  
Units issued (in shares)   4,000,000      
Premium to liquidation value in redemption after June 29, 2021   10.00%      
Premium to liquidation value in redemption after June 29, 2022   5.00%      
Number of consecutive trading period   10 days      
Redemption price (USD per unit)   $ 4.00     $ 23.75
Percent of common units purchased   90.00%      
Change in ownership of general partner   50.00%      
Teekay Offshore | Induced Exchange of Series C Preferred Units | Series C Preferred Stock          
Redeemable Noncontrolling Interest [Line Items]          
Shares converted   1,900,000      
Teekay Offshore | Extinguishment of Series C Preferred Units | Series C Preferred Stock          
Redeemable Noncontrolling Interest [Line Items]          
Shares converted   8,500,000      
Teekay Offshore | Limited Partner | Common Stock          
Redeemable Noncontrolling Interest [Line Items]          
Conversion of convertible securities (in shares)   8,300,000