Derivative Instruments and Hedging Activities - Interest Rate Swap Agreements (Detail) $ in Thousands, € in Millions	6 Months Ended
Jun. 30, 2017 USD ($)	Jun. 30, 2017 EUR (€)
U.S. Dollar-denominated interest rate swaps \| LIBOR
Derivative [Line Items]
Principal Amount	$ 2,680,734
Fair Value / Carrying Amount of Asset / (Liability)	$ (247,864)
Weighted-Average Remaining Term (Years)	5 years 2 months 12 days
Fixed Interest Rate	3.30%	3.30%
U.S. Dollar-denominated interest rate swaps \| LIBOR
Derivative [Line Items]
Principal Amount	$ 517,629
Fair Value / Carrying Amount of Asset / (Liability)	$ (21,329)
Weighted-Average Remaining Term (Years)	3 years 10 months 24 days
Fixed Interest Rate	3.00%	3.00%
U.S. Dollar-denominated interest rate swaption \| LIBOR
Derivative [Line Items]
Principal Amount	$ 160,000
Fair Value / Carrying Amount of Asset / (Liability)	$ (959)
Weighted-Average Remaining Term (Years)	7 months 2 days
Fixed Interest Rate	2.00%	2.00%
U.S. Dollar-denominated interest rate swaption \| LIBOR
Derivative [Line Items]
Principal Amount	$ 160,000
Fair Value / Carrying Amount of Asset / (Liability)	$ 154
Weighted-Average Remaining Term (Years)	7 months 2 days
Fixed Interest Rate	3.10%	3.10%
Euro-denominated interest rate swaps
Derivative [Line Items]
Principal Amount \| €		€ 201.6
Euro-denominated interest rate swaps \| EURIBOR
Derivative [Line Items]
Principal Amount	$ 230,343
Fair Value / Carrying Amount of Asset / (Liability)	$ (30,856)
Weighted-Average Remaining Term (Years)	3 years 6 months
Fixed Interest Rate	3.10%	3.10%
Interest rate swap agreements
Derivative [Line Items]
Fair Value / Carrying Amount of Asset / (Liability)	$ (300,854)

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=77997519&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=77997519&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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