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Derivative Instruments and Hedging Activities - Effect of Gain (Loss) on Derivatives Not Designated as Hedging Instruments (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Realized losses relating to: |  |  |
Derivative instruments not designated as hedging instruments realized (loss) gain net | $ (140,519) | $ (131,179) | $ (160,451)
Unrealized gains (losses) relating to: |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | 38,319 | (100,496) | 178,865
Total realized and unrealized (losses) gains on derivative instruments | (102,200) | (231,675) | 18,414
Interest Rate Swap Agreements [Member] |  |  |
Realized losses relating to: |  |  |
Derivative instruments not designated as hedging instruments realized (loss) gain net | (108,036) | (125,424) | (122,439)
Unrealized gains (losses) relating to: |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | 37,723 | (86,045) | 182,800
Interest Rate Swaps Terminated [Member] |  |  |
Realized losses relating to: |  |  |
Derivative instruments not designated as hedging instruments realized (loss) gain net | (10,876) | (1,319) | (35,985)
Foreign currency forward contracts [Member] |  |  |
Realized losses relating to: |  |  |
Derivative instruments not designated as hedging instruments realized (loss) gain net | (21,607) | (4,436) | (2,027)
Unrealized gains (losses) relating to: |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | (418) | (16,926) | $ (3,935)
Stock purchase warrants [Member] |  |  |
Unrealized gains (losses) relating to: |  |  |
Derivative instruments not designated as hedging instruments unrealized gain (loss) net | $ 1,014 | $ 2,475 |

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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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- Definition Realized losses gains. + References No definition available. + 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=56946850&loc=SL5624171-113959 + Details
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