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Derivative Instruments and Hedging Activities - Effect of (Loss) Gain 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, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Realized (losses) gains relating to: |  |  |  |
Derivative instruments not designated as hedging instruments realized gain (loss) net | $ (30,645) | $ (36,959) | $ (60,420) | $ (66,890)
Unrealized (losses) gains relating to: |  |  |  |
Derivative instruments not designated as hedging instruments unrealized (loss) gain net | (44,686) | 92,994 | (62,159) | 109,136
Total realized and unrealized (losses) gains on derivative instruments | (75,331) | 56,035 | (122,579) | 42,246
Interest rate swap agreements [Member] |  |  |  |
Realized (losses) gains relating to: |  |  |  |
Derivative instruments not designated as hedging instruments realized gain (loss) net | (30,755) | (30,899) | (60,245) | (61,251)
Unrealized (losses) gains relating to: |  |  |  |
Derivative instruments not designated as hedging instruments unrealized (loss) gain net | (39,096) | 96,911 | (64,494) | 116,115
Interest rate swap agreement terminations [Member] |  |  |  |
Realized (losses) gains relating to: |  |  |  |
Derivative instruments not designated as hedging instruments realized gain (loss) net |  | (4,187) | 1,000 | (4,187)
Foreign currency forward contracts [Member] |  |  |  |
Realized (losses) gains relating to: |  |  |  |
Derivative instruments not designated as hedging instruments realized gain (loss) net | 110 | (1,873) | (1,175) | (1,452)
Unrealized (losses) gains relating to: |  |  |  |
Derivative instruments not designated as hedging instruments unrealized (loss) gain net | (1,926) | (3,917) | 1,125 | (6,979)
Stock purchase warrants [Member] |  |  |  |
Unrealized (losses) gains relating to: |  |  |  |
Derivative instruments not designated as hedging instruments unrealized (loss) gain net | $ (3,664) |  | $ 1,210 |

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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 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=35706170&loc=SL5624171-113959 + Details
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