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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]      
Income from vessel operations $ 6,700 $ 384,290 $ 625,132
Equity Method Investments      
Schedule of Equity Method Investments [Line Items]      
Revenues 980,078 882,650 985,318
Income from vessel operations 258,006 365,472 433,023
Realized and unrealized (loss) gain on non-designated derivative instruments (17,438) (10,900) (38,955)
Net income 38,646 239,766 $ 275,259
Equity Method Investments | Other assets - current      
Schedule of Equity Method Investments [Line Items]      
Current assets 370,790 150,378  
Equity Method Investments | Other assets - non-current      
Schedule of Equity Method Investments [Line Items]      
Non-current assets 500,108 74,096  
Equity Method Investments | Other liabilities - current      
Schedule of Equity Method Investments [Line Items]      
Current liabilities 593,968 160,312  
Equity Method Investments | Other liabilities - non-current      
Schedule of Equity Method Investments [Line Items]      
Non-current liabilities 751,416 213,060  
Equity Method Investments | Vessels and Equipment      
Schedule of Equity Method Investments [Line Items]      
Non-current assets 8,056,504 4,655,170  
Cash and restricted cash | Cash      
Schedule of Equity Method Investments [Line Items]      
Current assets 555,566 500,355  
Net investment in direct financing leases      
Schedule of Equity Method Investments [Line Items]      
Non-current assets 1,973,307 1,776,954  
Current portion of long-term debt and obligations related to capital leases      
Schedule of Equity Method Investments [Line Items]      
Current liabilities 764,098 360,942  
Long-term debt and obligations related to capital leases      
Schedule of Equity Method Investments [Line Items]      
Non-current liabilities $ 5,957,406 $ 4,208,214