Derivative Instruments and Hedging Activities - Interest Rate Swap Agreements (Detail) $ in Thousands, € in Millions	6 Months Ended
Jun. 30, 2015 USD ($)	Jun. 30, 2015 EUR (€)
U.S. Dollar-denominated interest rate swaps 1 [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Principal Amount	$ 3,203,703
Fair Value / Carrying Amount of Asset / (Liability)	$ (305,934)
Weighted-Average Remaining Term (Years)	5 years 9 months 18 days
Fixed Interest Rate	3.40%	3.40%
U.S. Dollar-denominated interest rate swaps 2 [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Principal Amount	$ 500,000
Fair Value / Carrying Amount of Asset / (Liability)	$ (20,550)
Weighted-Average Remaining Term (Years)	6 months
Fixed Interest Rate	3.10%	3.10%
U.S. Dollar-denominated interest rate swaps 3 [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Principal Amount	$ 155,000
Fair Value / Carrying Amount of Asset / (Liability)	$ (1,365)
Weighted-Average Remaining Term (Years)	7 years 6 months
Fixed Interest Rate	2.20%	2.20%
U.S. Dollar-denominated interest rate swaps 4 [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Derivative [Line Items]
Principal Amount	$ 155,000
Fair Value / Carrying Amount of Asset / (Liability)	$ 1,958
Weighted-Average Remaining Term (Years)	7 years 6 months
Fixed Interest Rate	3.30%	3.30%
Euro-denominated interest rate swaps [Member]
Derivative [Line Items]
Principal Amount \| €		€ 229.2
Euro-denominated interest rate swaps [Member] \| Euro Interbank Offered Rate Euribor [Member]
Derivative [Line Items]
Principal Amount	$ 255,316
Fair Value / Carrying Amount of Asset / (Liability)	$ (35,874)
Weighted-Average Remaining Term (Years)	5 years 6 months
Fixed Interest Rate	3.10%	3.10%
Interest rate swap agreements [Member]
Derivative [Line Items]
Fair Value / Carrying Amount of Asset / (Liability)	$ (361,765)

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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

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- Definition

Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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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 815

-SubTopic 10

-Section 45

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

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 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611

Reference 4: 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=49121117&loc=d3e13495-108611

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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