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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2015
USD ($)
Vessel
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Depreciation of vessels and equipment $ 83.4 $ 70.1 $ 71.4
Interest costs capitalized to vessels and equipment $ 8.2 $ 3.1 $ 1.3
Spain [Member]      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Tax rate in Spain 28.00%    
Number of vessels | Vessel 2    
Effective income tax rate on revenue by Spanish vessels tax credit 90.00%    
Effective tax rate on revenues by Spanish vessels 2.80%    
Conventional Tankers [Member]      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Estimated useful life in years 25 years    
Liquefied Petroleum Gas [Member]      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Estimated useful life in years 30 years    
Liquefied Natural Gas [Member]      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Estimated useful life in years 35 years