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Derivative Instruments and Hedging Activities - Interest Rate Swap Agreements (Detail) In Thousands, unless otherwise specified | 6 Months Ended |  | 6 Months Ended |
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Jun. 30, 2014 U.S. Dollar-denominated interest rate swaps 1 [Member] London Interbank Offered Rate (LIBOR) [Member] USD ($) | Jun. 30, 2014 U.S. Dollar-denominated interest rate swaps 2 [Member] London Interbank Offered Rate (LIBOR) [Member] USD ($) | Jun. 30, 2014 U.S. Dollar-denominated interest rate swaps 3 [Member] London Interbank Offered Rate (LIBOR) [Member] USD ($) | Jun. 30, 2014 U.S. Dollar-denominated interest rate swaps 4 [Member] London Interbank Offered Rate (LIBOR) [Member] USD ($) | Jun. 30, 2014 Euro-denominated interest rate swaps [Member] EUR (€) | Jun. 30, 2014 Euro-denominated interest rate swaps [Member] Euro Interbank Offered Rate Euribor [Member] USD ($) | Jun. 30, 2014 Interest rate swap agreements [Member] USD ($)
Derivative [Line Items] |  |  |  |  |  |  |
Principal Amount | $ 400,757 | $ 3,653,623 | $ 500,000 | $ 469,066 | € 241,700 | $ 330,845 |
Fair Value / Carrying Amount of Asset / (Liability) | $ (91,531) | $ (362,136) | $ (7,416) | $ 121,309 |  | $ (44,034) | $ (383,808)
Weighted-Average Remaining Term (Years) | 22 years 7 months 6 days | 6 years 1 month 6 days | 1 year 2 months 12 days | 22 years 7 months 6 days |  | 6 years 6 months |
Fixed Interest Rate | 4.90% | 3.60% | 3.10% | 4.80% |  | 3.10% |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 + Details
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