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Segment Reporting - Segment Reporting Information (Detail) (USD $)
In Thousands, unless otherwise specified
 1 Months Ended 12 Months Ended
Nov. 30, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]        
Voyage revenues   $ 392,251 $ 379,975 $ 374,008
Voyage expenses   1,772 1,387 2,042
Vessel operating expenses   86,347 89,046 84,577
Depreciation and amortization   99,825 91,919 89,347
General and administrative   27,149 24,120 23,247
Write down of vessels   29,367    
Gain on sale of vessel (4,300)     (4,340)
Restructuring charge       175
Income from vessel operations   147,791 173,503 178,960
Equity income   78,866 20,584 8,043
Investment in and advances to equity accounted joint ventures   409,735 191,448  
Total assets   3,638,761 3,464,348  
Expenditures for vessels and equipment   39,894 64,685 26,652
Expenditures for dry docking   7,493 19,638 12,727
Liquefied Gas Segment [Member]
        
Segment Reporting Information [Line Items]        
Voyage revenues   278,511 269,408 264,816
Voyage expenses   66 (87) 29
Vessel operating expenses   45,816 47,773 46,496
Depreciation and amortization   69,064 62,889 60,954
General and administrative   17,532 13,385 12,239
Gain on sale of vessel       (4,340)
Income from vessel operations   146,033 145,448 149,438
Equity income   78,866 20,584 8,043
Investment in and advances to equity accounted joint ventures   409,735 191,448  
Total assets   3,143,205 2,911,659  
Expenditures for vessels and equipment   39,366 63,686 24,095
Expenditures for dry docking   6,054 13,831 2,014
Conventional Tanker Segment [Member]
        
Segment Reporting Information [Line Items]        
Voyage revenues   113,740 110,567 109,192
Voyage expenses   1,706 1,474 2,013
Vessel operating expenses   40,531 41,273 38,081
Depreciation and amortization   30,761 29,030 28,393
General and administrative   9,617 10,735 11,008
Write down of vessels   29,367    
Restructuring charge       175
Income from vessel operations   1,758 28,055 29,522
Total assets   495,556 552,689  
Expenditures for vessels and equipment   528 999 2,557
Expenditures for dry docking   $ 1,439 $ 5,807 $ 10,713