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Vessel Sales and Write-downs - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Long Lived Assets Held-for-sale [Line Items]      
Realized gain (loss) on sale of joint venture interest $ 79,211,000 $ (35,309,000) $ (11,257,000)
Conventional tanker segment [Member]
      
Long Lived Assets Held-for-sale [Line Items]      
Write-down estimated fair value 405,300,000    
Number of vessels written down 19    
Suezmax Tankers [Member] | Conventional tanker segment [Member]
      
Long Lived Assets Held-for-sale [Line Items]      
Write-down estimated fair value 335,000,000    
Number of vessels written down 10    
Aframax tanker [Member] | Conventional tanker segment [Member]
      
Long Lived Assets Held-for-sale [Line Items]      
Write-down estimated fair value 66,000,000    
Number of vessels written down 7    
Number of tankers held for sale 1    
Other conventional tankers [Member] | Conventional tanker segment [Member]
      
Long Lived Assets Held-for-sale [Line Items]      
Write-down estimated fair value 4,300,000    
Number of vessels written down 2    
Seven Suezmax tankers and four Aframax tankers [Member] | Conventional tanker segment [Member]
      
Long Lived Assets Held-for-sale [Line Items]      
Write-down estimated fair value 350,200,000    
Shuttle tanker and FSO segment [Member]
      
Long Lived Assets Held-for-sale [Line Items]      
Write-down estimated fair value 28,800,000 43,200,000  
Future operating life (based on the estimated remaining trading life of vessel) 2 years 2 months 12 days    
Future revenue (based on field production forecasts and the availability of contracts of affreightment suitable for vessel) 37,200,000    
Operating and dry-dock expenditures 20,500,000    
Residual value (based on vessel's light weight tonnage and price of steel) 6,500,000    
Discount rate (approximate weighted average cost of capital of a market participant) 7.90%    
Number of vessels whose estimated fair value was determined using an appraised value 4    
Number of vessels whose estimated fair value was determined using discounted cash flow method 1    
Shuttle tankers [Member]
      
Long Lived Assets Held-for-sale [Line Items]      
Realized gain (loss) on sale of tanker 1,100,000    
Number of vessels sold 2    
Number of vessels written down 4 3 1
Write-down for impairment of vessels     19,500,000
Conventional tanker [Member]
      
Long Lived Assets Held-for-sale [Line Items]      
Realized gain (loss) on sale of tanker 5,900,000   2,300,000
Number of vessels sold 3 1 4
Write-down estimated fair value   112,100,000  
Number of vessels written down   8  
Write-down of intangibles     31,700,000
Ikdam FPSO unit [Member]
      
Long Lived Assets Held-for-sale [Line Items]      
Realized gain (loss) on sale of joint venture interest 10,800,000    
FSO Unit [Member]
      
Long Lived Assets Held-for-sale [Line Items]      
Realized gain (loss) on sale of tanker   200,000  
Number of vessels sold   1  
Number of vessels written down 1 1  
LPG carrier [Member] | Liquefied Gas Segment [Member]
      
Long Lived Assets Held-for-sale [Line Items]      
Realized gain (loss) on sale of tanker     4,300,000
Number of vessels sold     1
PTH [Member]
      
Long Lived Assets Held-for-sale [Line Items]      
Write-down of Investments   $ 19,400,000  
Percentage of Joint venture interests   50.00%