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Derivative Instruments and Hedging Activities - Interest Rate Swap Agreements (Detail) $ in Thousands, € in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 EUR (€)
U.S. Dollar-denominated interest rate swaps 1 | LIBOR
Derivative [Line Items]
Principal Amount	$ 1,137,671
Fair Value / Carrying Amount of Asset / (Liability)	$ (33,882)
Weighted-Average Remaining Term (years)	4 years 9 months 18 days
Fixed Rate Payable	2.80%	2.80%
U.S. Dollar-denominated interest rate swaps 2 | LIBOR
Derivative [Line Items]
Principal Amount	$ 160,000
Fair Value / Carrying Amount of Asset / (Liability)	$ (9,360)
Weighted-Average Remaining Term (years)	3 months 18 days
Fixed Rate Payable	3.50%	3.50%
U.S. Dollar-denominated interest rate swaption 1 | LIBOR
Derivative [Line Items]
Principal Amount	$ 160,000
Fair Value / Carrying Amount of Asset / (Liability)	$ (2)
Weighted-Average Remaining Term (years)	1 month 6 days
Fixed Rate Payable	2.00%	2.00%
U.S. Dollar-denominated interest rate swaption 2 | LIBOR
Derivative [Line Items]
Principal Amount	$ 160,000
Fair Value / Carrying Amount of Asset / (Liability)	$ 0
Weighted-Average Remaining Term (years)	1 month 6 days
Fixed Rate Payable	3.10%	3.10%
Euro-denominated interest rate swaps
Derivative [Line Items]
Principal Amount | €		€ 194.1
Euro-denominated interest rate swaps | EURIBOR
Derivative [Line Items]
Principal Amount	$ 232,957
Fair Value / Carrying Amount of Asset / (Liability)	$ (29,235)
Weighted-Average Remaining Term (years)	2 years 11 months 15 days
Fixed Rate Payable	3.10%	3.10%
Interest Rate Swap Agreements
Derivative [Line Items]
Fair Value / Carrying Amount of Asset / (Liability)	$ (72,479)

X

- 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

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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

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- Definition

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