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Derivative Instruments and Hedging Activities - Effect of Gain (Loss) on Derivatives Not Designated as Hedging Instruments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Realized (losses) gains relating to: |  |  |  |
Derivative instruments not designated as hedging instruments realized gain (loss) net | $ (36,959) | $ (29,522) | $ (66,890) | $ (47,249)
Unrealized gains (losses) relating to: |  |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | 92,994 | (65,076) | 109,136 | (42,534)
Total realized and unrealized gains (losses) on derivative instruments | 56,035 | (94,598) | 42,246 | (89,783)
Interest rate swap agreements [Member] |  |  |  |
Realized (losses) gains relating to: |  |  |  |
Derivative instruments not designated as hedging instruments realized gain (loss) net | (30,899) | (29,669) | (61,251) | (60,085)
Unrealized gains (losses) relating to: |  |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | 96,911 | (58,425) | 116,115 | (41,290)
Interest rate swap agreement terminations [Member] |  |  |  |
Realized (losses) gains relating to: |  |  |  |
Derivative instruments not designated as hedging instruments realized gain (loss) net | (4,187) |  | (4,187) |
Foreign currency forward contracts [Member] |  |  |  |
Realized (losses) gains relating to: |  |  |  |
Derivative instruments not designated as hedging instruments realized gain (loss) net | (1,873) | 147 | (1,452) | 1,384
Unrealized gains (losses) relating to: |  |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | (3,917) | (6,651) | (6,979) | 2,141
Foinaven embedded derivative [Member] |  |  |  |
Realized (losses) gains relating to: |  |  |  |
Derivative instruments not designated as hedging instruments realized gain (loss) net |  |  |  | 11,452
Unrealized gains (losses) relating to: |  |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net |  |  |  | $ (3,385)

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- Definition Derivative instruments not designated as hedging instruments realized gain loss net. + References No definition available. + Details
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- Definition Derivative instruments not designated as hedging instruments unrealized gain loss net. + References No definition available. + Details
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- Details
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- Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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