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Supplemental Cash Flow Information - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Nov. 14, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule Of Supplemental Cash Flow [Line Items]        
Cash interest paid, including realized interest rate swap settlements   $ 227,500 $ 290,300 $ 242,900
Cash interest paid relating to interest rate swap amendments and terminations   0 0 13,700
Operating Lease, Right-of-Use Asset   52,961 159,638  
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability   800 $ 47,700  
Shuttle Tankers        
Schedule Of Supplemental Cash Flow [Line Items]        
Operating Lease, Right-of-Use Asset   50,700    
Lease liability   $ 50,700    
Bahrain LNG Joint Venture | Teekay LNG        
Schedule Of Supplemental Cash Flow [Line Items]        
Due from Joint Ventures, Noncurrent       $ 79,100
Equity Interest In Joint Ventures $ 7,900      
Subordinated Debt $ 71,200      
Subordinated Borrowing, Interest Rate 6.00%