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Segment Reporting (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Segment results information      
Revenues $ 1,953,782 $ 2,095,753 $ 2,181,605
Voyage expenses 176,614 245,097 294,091
Vessel operating expenses 677,687 630,547 615,764
Time-charter hire expense 214,179 285,992 438,877
Depreciation and amortization 428,608 440,705 437,176
General and administrative 223,616 193,743 198,836
Asset impairments and net loss (gain) on sale of vessels and equipment 151,059 49,150 12,629
Bargain purchase gain (58,235)    
Write-down for impairment of goodwill 36,652    
Restructuring charges 5,490 16,396 14,444
Income (loss) from vessel operations 98,112 234,123 169,788
Segment assets 9,905,629 8,557,323  
Shuttle Tanker and FSO Segment [Member]
      
Segment results information      
Revenues 613,768 622,195 583,320
Voyage expenses 97,743 111,003 86,499
Vessel operating expenses 196,536 182,614 173,463
Time-charter hire expense 74,478 89,768 113,786
Depreciation and amortization 129,293 127,438 122,630
General and administrative 60,359 51,281 50,923
Asset impairments and net loss (gain) on sale of vessels and equipment 43,356 19,480 1,902
Restructuring charges 5,351 704 7,032
Income (loss) from vessel operations 6,652 39,907 27,085
Segment assets 2,182,461 1,811,186  
FPSO Segment [Member]
      
Segment results information      
Revenues 464,810 463,931 390,576
Vessel operating expenses 242,332 209,283 200,856
Depreciation and amortization 96,915 95,784 102,316
General and administrative 52,854 42,714 34,276
Asset impairments and net loss (gain) on sale of vessels and equipment (4,888)    
Bargain purchase gain (58,235)    
Income (loss) from vessel operations 135,832 116,150 53,128
Segment assets 2,225,830 1,185,017  
Liquefied Gas Segment [Member]
      
Segment results information      
Revenues 272,041 248,378 246,472
Voyage expenses 4,862 29 1,018
Vessel operating expenses 48,158 46,497 50,704
Depreciation and amortization 63,641 62,904 59,868
General and administrative 20,586 20,147 20,007
Asset impairments and net loss (gain) on sale of vessels and equipment   (4,340)  
Restructuring charges   394 4,177
Income (loss) from vessel operations 134,794 122,747 110,698
Segment assets 2,924,653 2,869,713  
Conventional Tanker Segment [Member]
      
Segment results information      
Revenues 603,163 761,249 961,237
Voyage expenses 74,009 134,065 206,574
Vessel operating expenses 190,661 192,153 190,741
Time-charter hire expense 139,701 196,224 325,091
Depreciation and amortization 138,759 154,579 152,362
General and administrative 89,817 79,601 93,360
Asset impairments and net loss (gain) on sale of vessels and equipment 112,591 34,010 10,727
Write-down for impairment of goodwill 36,652    
Restructuring charges 139 15,298 3,235
Income (loss) from vessel operations (179,166) (44,681) (21,123)
Segment assets $ 2,572,685 $ 2,691,407