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Acquisition of FPSO Units and Investment in Sevan Marine ASA (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2011
Feb. 29, 2012
Nov. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Business Acquisition [Line Items]          
Ownership interest   52.00%     33.00%
Acquisition cost       $ 386,300,000  
Outstanding balance of credit facility     220,497,000    
Bargain purchase gain 58,235,000        
Acquisition of FPSO Units and Investment in Sevan Marine ASA (Textual) [Abstract]          
Income from acquisition, including bargain purchase gain 60,300,000        
Acquisition-related expenses 1,100,000        
FPSO Segment [Member]
         
Business Acquisition [Line Items]          
Bargain purchase gain 58,200,000        
REVENUES 14,500,000,000        
FPSO Unit Sevan Hummingbird [Member]
         
Business Acquisition [Line Items]          
Acquisition cost     184,000,000    
Extension option of contract one six-month extension option, one three-year extension option and two one-year extension options.        
FPSO Sevan Piranema [Member]
         
Business Acquisition [Line Items]          
Number of Extension option     11    
FPSO Unit Sevan Piranema [Member]
         
Business Acquisition [Line Items]          
Acquisition cost 94,000,000   164,000,000    
Extension option of contract up to 11 one-year extension options        
Sevan Marine ASA [Member]
         
Business Acquisition [Line Items]          
Ownership interest     40.00%    
Acquisition cost     25,000,000    
FPSO Unit Sevan Voyageur [Member]
         
Business Acquisition [Line Items]          
Outstanding balance of credit facility     220,000,000    
Minimum upgrade cost     110,000,000    
Maximum upgrade cost     130,000,000    
Voyageur [Member]
         
Business Acquisition [Line Items]          
Extension option period 5 years        
Voyageur [Member] | Line of Credit [Member]
         
Business Acquisition [Line Items]          
Assume existing credit facility $ 230,000,000