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Commitments and Contingencies - Additional Information - Redeemable Non-Controlling Interest (Detail) - Teekay Offshore - $ / shares
1 Months Ended
Jul. 31, 2015
Jun. 30, 2016
Jul. 31, 2015
Sep. 30, 2017
Sep. 25, 2017
Sep. 30, 2016
Redeemable Noncontrolling Interest [Line Items]            
Weighted average price of common units (dollars per share) $ 35.925          
Series C Preferred Stock            
Redeemable Noncontrolling Interest [Line Items]            
Units issued (in units)     10,400,000      
Preferred units dividend rate     8.60%      
Conversion period   18 months 18 months      
Shares issued upon conversion (in units) 1   1      
Period for optional conversion to common units     3 years      
Series C-1 Preferred Units            
Redeemable Noncontrolling Interest [Line Items]            
Shares issued upon conversion (in units)       1.474    
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 per share (in dollars per share)         $ 18.20  
Series D Preferred Stock            
Redeemable Noncontrolling Interest [Line Items]            
Units issued (in units)   4,000,000        
Preferred units dividend rate   10.50%        
Premium to liquidation value in redemption after June 29, 2021   10.00%        
Premium to liquidation value in redemption after June 29, 2022   5.00%        
Consecutive trading days   10 days        
Redemption price per share (in dollars per share)         $ 23.75 $ 4.00
Percent of common units purchased   90.00%        
Change in ownership percentage of the general partner (or more)   50.00%        
Induced Exchange of Series C Preferred Units | Series C Preferred Stock            
Redeemable Noncontrolling Interest [Line Items]            
Shares converted (in shares)   1,900,000        
Extinguishment of Series C Preferred Units | Series C Preferred Stock            
Redeemable Noncontrolling Interest [Line Items]            
Shares converted (in shares)   8,500,000        
Limited Partner | Common Stock            
Redeemable Noncontrolling Interest [Line Items]            
Conversion of convertible securities (in shares)   8,300,000