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VESSELS AND EQUIPMENT, NET (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Vessels
Dec. 31, 2010
Dec. 31, 2009
Components of vessels and equipment, net:      
Net book value $ 1,203,003,000 $ 1,103,137,000  
Number of owned shipping vessels   9  
Depreciation and amortization expense 70,286,000 65,076,000  
Vessels and equipment
      
Components of vessels and equipment, net:      
Cost 1,584,365,000 1,446,457,000  
Accumulated depreciation and amortization (381,362,000) (343,320,000)  
Number of owned shipping vessels 9    
Depreciation and amortization expense 54,300,000 52,800,000 21,500,000
Drydocking
      
Components of vessels and equipment, net:      
Cost 39,800,000 37,400,000  
Accumulated depreciation and amortization (12,100,000) (21,700,000)  
Office equipment
      
Components of vessels and equipment, net:      
Cost 1,700,000 2,000,000  
Vessels
      
Components of vessels and equipment, net:      
Amounts pledged as collateral 1,201,000,000 1,101,000,000  
Other costs capitalized | Nusantara Regas Satu
      
Components of vessels and equipment, net:      
Cost $ 128,800,000