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Segment Reporting - Reconciliation of Total Segment Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Segment Reporting Information [Line Items]        
Total assets $ 3,638,761 $ 3,464,348    
Cash and cash equivalents 113,577 93,627 81,055 108,350
Accounts receivable and prepaid expenses 19,244 18,837    
Advances to affiliates 13,864 11,922    
Consolidated total assets 3,785,446 3,588,734    
Liquefied Gas Segment [Member]
        
Segment Reporting Information [Line Items]        
Total assets 3,143,205 2,911,659    
Conventional Tanker Segment [Member]
        
Segment Reporting Information [Line Items]        
Total assets $ 495,556 $ 552,689