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Equity-accounted Investments - Additional Information (Detail)
 1 Months Ended 3 Months Ended 4 Months Ended 12 Months Ended
May 08, 2019
USD ($)
Jan. 31, 2018
USD ($)
Nov. 30, 2018
USD ($)
Dec. 31, 2015
ft³
Dec. 31, 2018
USD ($)
May 08, 2019
USD ($)
Dec. 31, 2020
USD ($)
vessel
lease
m³
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2016
Dec. 02, 2015
Nov. 30, 2011
USD ($)
Schedule of Equity Method Investments [Line Items]                        
Investments in subsidiaries             $ 1,075,653,000 $ 1,173,728,000        
Investment in equity private placement             1,075,691,000 1,163,322,000        
Equity income             $ 77,333,000 $ (14,523,000) $ 61,054,000      
Minimum                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership interest             20.00%          
Maximum                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership interest             52.00%          
Bahrain LNG Joint Venture                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership interest             30.00%          
Altera                        
Schedule of Equity Method Investments [Line Items]                        
Proceeds from sale of assets, net of cash sold (notes 13 and 18) $ 100,000,000                      
Equity Method Investment, Realized Gain (Loss) on Disposal             $ 8,900,000          
Due from Affiliate, Noncurrent 25,000,000         $ 25,000,000            
Equity Method Investment, Other than Temporary Impairment             64,900,000          
Magnora ASA [Member]                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership interest               43.50%       40.00%
Proceeds from sale of assets, net of cash sold (notes 13 and 18)     $ 27,000,000                  
Equity Method Investment, Realized Gain (Loss) on Disposal         $ 15,300,000              
Investment in equity private placement                       $ 25,000,000
Teekay LNG                        
Schedule of Equity Method Investments [Line Items]                        
Principal Amount Outstanding On Secured Loan Facilities and Fair Value of Interest Rate Swaps             1,400,000,000          
Equity Method Investment, Realized Gain (Loss) on Disposal             $ 5,600,000          
Teekay LNG | Angola Joint Venture                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership interest             33.00%          
Number of vessels | vessel             4          
Volume of vessels (in cubic meters) | m³             160,400          
Principal Amount Outstanding On Secured Loan Facilities and Fair Value of Interest Rate Swaps             $ 203,400,000          
Guarantor Obligations, Current Carrying Value             300,000 $ 500,000        
Teekay LNG | Bahrain LNG Joint Venture                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership interest                     30.00%  
Investments in subsidiaries             $ 73,400,000 73,400,000        
Debt instrument spread on variable rate             6.00%          
Interest receivable             $ 4,600,000 2,800,000        
Due from joint ventures         $ 79,100,000       79,100,000      
Teekay LNG | Bahrain LNG Joint Venture | LNG receiving and regasification terminal                        
Schedule of Equity Method Investments [Line Items]                        
Capacity of production facility, per day | ft³       800,000,000                
Onshore nitrogen production facility lease period (in years)             20 years          
Teekay LNG | Excalibur Joint Venture                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership interest   50.00%                    
Guarantor Obligations, Current Carrying Value             $ 100,000          
Principal Amount Outstanding On Secured Loan Facilities             15,900,000          
Difference between carrying amount and book value             $ 12,000,000.0 12,500,000        
Teekay LNG | Excelsior Joint Venture                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership interest   50.00%                    
Teekay LNG | Excalibur Joint Venture And Excelsior Joint Venture                        
Schedule of Equity Method Investments [Line Items]                        
Proceeds from sale of assets, net of cash sold (notes 13 and 18)   $ 54,000,000                    
Teekay LNG | Exmar LPG Joint Venture                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership interest             50.00%     50.00%    
Guarantor Obligations, Current Carrying Value             $ 1,300,000 900,000        
Interest receivable             0 300,000        
Principal Amount Outstanding On Secured Loan Facilities And Finance Leases             238,200,000          
Difference between carrying amount and book value             $ 18,200,000 23,600,000        
Number of Lessors | lease             4          
Due from joint ventures             $ 42,300,000 52,300,000        
Teekay LNG | MALT Joint Venture                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership interest             52.00%          
Guarantor Obligations, Current Carrying Value             $ 200,000 300,000        
Teekay LNG | Pan Union Joint Venture                        
Schedule of Equity Method Investments [Line Items]                        
Difference between carrying amount and book value             $ 10,000,000.0 10,500,000        
Teekay LNG | Pan Union Joint Venture | Pan Asia and Pan Americas                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership interest             30.00%          
Teekay LNG | Pan Union Joint Venture | Pan Europe and Pan Africa                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership interest             20.00%          
Teekay LNG | Pan Union Joint Venture | LNG Carriers | Pan Asia and Pan Americas                        
Schedule of Equity Method Investments [Line Items]                        
Number of vessels | vessel             2          
Teekay LNG | Pan Union Joint Venture | LNG Carriers | Pan Europe and Pan Africa                        
Schedule of Equity Method Investments [Line Items]                        
Number of vessels | vessel             2          
Teekay LNG | RasGas III Joint Venture                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership interest             40.00%          
Teekay LNG | Yamal LNG Joint Venture                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership interest   50.00%         50.00%          
Principal Amount Outstanding On Secured Loan Facilities and Fair Value of Interest Rate Swaps             $ 807,700,000          
Guarantor Obligations, Current Carrying Value             $ 2,200,000 2,200,000        
Teekay LNG | Yamal LNG Joint Venture | LNG Carriers                        
Schedule of Equity Method Investments [Line Items]                        
Number of vessels | vessel             6          
Teekay LNG | LIBOR | Exmar LPG Joint Venture                        
Schedule of Equity Method Investments [Line Items]                        
Debt instrument spread on variable rate             0.50%          
MALT Joint Venture                        
Schedule of Equity Method Investments [Line Items]                        
Principal Amount Outstanding On Secured Loan Facilities             $ 134,600,000          
Teekay Tankers | High-Q Joint Venture                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership interest             50.00%          
Teekay Tankers | High-Q Joint Venture | VLCC                        
Schedule of Equity Method Investments [Line Items]                        
Number of vessels | vessel             1          
Altera                        
Schedule of Equity Method Investments [Line Items]                        
Equity Method Investment, Realized Gain (Loss) on Disposal               8,900,000        
Due from Affiliate, Noncurrent $ 25,000,000.0         25,000,000.0            
Equity Method Investment, Other than Temporary Impairment               $ 64,900,000        
Equity income           $ (75,814,000) $ 0   $ (6,907,000)      
NYK Energy Transport | Angola Joint Venture                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership interest             33.00%          
Mitsui & Co. Ltd | Angola Joint Venture                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership interest             34.00%          
Nogaholdings | Teekay LNG | Bahrain LNG Joint Venture                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership interest                     30.00%  
GIC | Teekay LNG | Bahrain LNG Joint Venture                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership interest                     24.00%  
Samsung | Teekay LNG | Bahrain LNG Joint Venture                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership interest                     16.00%  
Exmar [Member] | Teekay LNG | Excalibur Joint Venture                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership interest   50.00%                    
Exmar NV | Teekay LNG | Exmar LPG Joint Venture                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership interest   50.00%                    
China LNG | Teekay LNG | Yamal LNG Joint Venture                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership interest   50.00%                    
Qatar Gas Transport Company Ltd | RasGas III Joint Venture                        
Schedule of Equity Method Investments [Line Items]                        
Equity method investment, ownership interest             60.00%          
Time charters | Teekay LNG | Bahrain LNG Joint Venture | LNG receiving and regasification terminal                        
Schedule of Equity Method Investments [Line Items]                        
Onshore nitrogen production facility lease period (in years)             21 years