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Equity-accounted Investments - Condensed Summary of Company's Financial Information for Joint Venture (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]      
Revenues $ 1,008,112 $ 1,103,255 $ 2,042,483
Equity Method Investment, Summarized Financial Information, Income (Loss) from Continuing Operations 584,685 482,767 401,966
Income from vessel operations 314,579 204,042 164,319
Realized and unrealized (loss) gain on non-designated derivative instruments (94,760) (72,305) 21,768
Net income (loss) 152,144 141,235 (6,188)
Equity Income (Loss) 77,333 (14,523) 61,054
Interest Rate Swap Agreements | Unrealized Gain Loss [Member]      
Schedule of Equity Method Investments [Line Items]      
Equity Income (Loss) (19,100) (12,900) $ 17,600
Other assets – current      
Schedule of Equity Method Investments [Line Items]      
Current assets 180,673 146,637  
Other liabilities – current      
Schedule of Equity Method Investments [Line Items]      
Current liabilities 232,466 188,665  
Other liabilities – non-current      
Schedule of Equity Method Investments [Line Items]      
Non-current liabilities 350,057 224,903  
Other assets – non-current      
Schedule of Equity Method Investments [Line Items]      
Non-current assets 216,331 169,925  
Vessels and Equipment      
Schedule of Equity Method Investments [Line Items]      
Non-current assets 1,912,776 3,045,393  
Cash and Restricted Cash      
Schedule of Equity Method Investments [Line Items]      
Current assets 400,816 375,800  
Net investment in direct financing leases      
Schedule of Equity Method Investments [Line Items]      
Non-current assets 5,237,791 4,469,861  
Current portion of long-term debt and obligations related to finance leases      
Schedule of Equity Method Investments [Line Items]      
Current liabilities 582,767 557,685  
Long-term Debt And Finance Lease Obligations      
Schedule of Equity Method Investments [Line Items]      
Non-current liabilities $ 4,853,791 $ 5,130,656