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Derivative Instruments and Hedging Activities - Interest Rate Swap Agreements (Detail) - 6 months ended Jun. 30, 2018 $ in Thousands, € in Millions	USD ($) interest_rate_swaps	EUR (€) interest_rate_swaps
U.S. Dollar-denominated interest rate swaps | LIBOR
Derivative [Line Items]
Principal Amount	$ 1,256,827
Fair value / carrying amount of asset / (liability)	$ (14,623)
Weighted-average remaining term (years)	4 years 1 month 6 days
Fixed interest rate	2.90%	2.90%
Euro-denominated interest rate swaps
Derivative [Line Items]
Principal Amount | €		€ 186.2
Reduced principal amount of interest rate swaps	$ 81,900	€ 70.1
Euro-denominated interest rate swaps | EURIBOR
Derivative [Line Items]
Principal Amount	217,621
Fair value / carrying amount of asset / (liability)	$ (26,107)
Weighted-average remaining term (years)	2 years 6 months
Fixed interest rate	3.10%	3.10%
Interest rate swap agreements
Derivative [Line Items]
Fair value / carrying amount of asset / (liability)	$ (40,730)
Derivative, number of instruments held | interest_rate_swaps	2	2
Minimum | Interest rate swap agreements
Derivative [Line Items]
Debt instrument, basis spread on variable rate	0.30%
Maximum | Interest rate swap agreements
Derivative [Line Items]
Debt instrument, basis spread on variable rate	4.00%

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

Reduced Principal Amount of Interest Rate Swaps

+ References

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

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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

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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

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-Name Accounting Standards Codification
-Topic 815
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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

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

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The number of derivative instruments of a particular group held by the entity.

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-SubTopic 10
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