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Other Loss (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Sep. 30, 2019
May 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Nov. 30, 2015
Jan. 27, 2010
Other Income (Loss) [Line Items]              
Gain (loss) on bond repurchases     $ 1,470,000 $ (10,601,000) $ (1,772,000)    
Credit loss provision     (16,997,000) 0 0    
Gain (loss) on bond repurchases     1,470,000 (10,601,000) (1,772,000)    
Loss on lease extinguishment     0 (1,417,000) 0    
Miscellaneous loss     (2,535,000) (2,457,000) (241,000)    
Other loss     (18,062,000) (14,475,000) (2,013,000)    
Teekay Parent              
Other Income (Loss) [Line Items]              
Other loss     $ 20,572,000 (5,662,000) $ (6,008,000)    
Senior Notes due 2022 [Member]              
Other Income (Loss) [Line Items]              
Repayments of senior debt   $ 460,900,000          
Senior Notes Due 2020 [Member]              
Other Income (Loss) [Line Items]              
Gain (loss) on bond repurchases       10,600,000      
Gain (loss) on bond repurchases       10,600,000      
Senior Notes (8.5%) due January 15, 2020              
Other Income (Loss) [Line Items]              
Repayments of senior debt       $ 613,300,000      
Debt Instrument, Face Amount           $ 200,000,000 $ 450,000,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate     8.50% 8.50%   8.50% 8.50%
Senior Notes (8.5%) due January 15, 2020 | Teekay Parent              
Other Income (Loss) [Line Items]              
Gain (loss) on bond repurchases     $ 1,500,000        
Repayments of senior debt       $ 613,300,000      
Debt Instrument, Face Amount           $ 200,000,000 $ 450,000,000
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate     8.50% 8.50%     8.50%
Gain (loss) on bond repurchases     $ 1,500,000        
Senior Notes due 2022 [Member]              
Other Income (Loss) [Line Items]              
Debt Instrument, Repurchased Face Amount     6,600,000        
Debt Instrument, Repurchase Amount     $ 6,200,000        
Debt Instrument, Face Amount   $ 250,000,000.0          
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   9.25% 9.25% 9.25%      
Senior Notes due 2022 [Member] | Teekay Parent              
Other Income (Loss) [Line Items]              
Debt Instrument, Face Amount   $ 250,000,000.0          
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   9.25% 9.25% 9.25%      
Teekay Parent [Member]              
Other Income (Loss) [Line Items]              
Gain (loss) on bond repurchases     $ 1,500,000        
Gain (loss) on bond repurchases     1,500,000        
September 2019 Transaction [Member] | Teekay LNG | Torben Spirit [Member]              
Other Income (Loss) [Line Items]              
Sale Leaseback Transaction, Lease Terms 7.5            
Loss on lease extinguishment     1,400,000        
Other Nonoperating Income (Expense) [Member] | Teekay LNG              
Other Income (Loss) [Line Items]              
Loss on lease extinguishment     $ 1,400,000