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Intangible Assets and Goodwill - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Goodwill And Intangible Assets [Line Items]      
Weighted-average amortization period of intangible assets consisted of time-charter contracts 15 years 10 months 24 days 19 years 2 months 12 days  
Amortization expense of intangible assets $ 11,000,000 $ 9,600,000 $ 9,600,000
Amortization expense of intangible assets, 2013 13,300,000    
Amortization expense of intangible assets, 2014 9,000,000    
Amortization expense of intangible assets, 2015 8,900,000    
Amortization expense of intangible assets, 2016 8,900,000    
Amortization expense of intangible assets, 2017 8,900,000    
Carrying amount of goodwill 35,631,000 35,631,000  
Liquefied Gas Segment [Member]
      
Goodwill And Intangible Assets [Line Items]      
Carrying amount of goodwill 35,631,000 35,631,000  
Goodwill impairment $ 0 $ 0