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Vessel Sales and Write-downs - Additional Information (Detail) (USD $) | 12 Months Ended
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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% |

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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 19 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=7658923&loc=d3e32787-111569 + Details
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