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Commitments and Contingencies - Additional Information - Vessels Under Construction (Detail)
$ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
vessel
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Long-term Purchase Commitment [Line Items]        
Carrying amount of long-term debt   $ 3,363,127 $ 3,449,611  
Net (loss) income   $ (57,747) (529,072) $ 86,664
Equity method investment, ownership interest   100.00%    
Payments made towards commitments for construction of certain carriers and tankers   $ 86,942 444,493  
Proceeds from financing related to sale-leaseback of vessels   $ 611,388 $ 809,935 $ 355,306
Newbuildings | Liquefied Natural Gas        
Long-term Purchase Commitment [Line Items]        
Number of vessels | vessel   1    
Equity method investment, ownership interest   100.00%    
Expected cost of project   $ 207,400    
Payments made towards commitments for construction of certain carriers and tankers   86,900    
Estimated remaining payments required to be made under newbuilding contract in 2019   $ 120,400    
Subsequent Events        
Long-term Purchase Commitment [Line Items]        
Proceeds from financing related to sale-leaseback of vessels $ 159,000