Derivative Instruments - Interest Rate Swap Agreements (Detail)	12 Months Ended
Dec. 31, 2015 USD ($)
United States Dollar-denominated interest rate swaps 1 [Member] \| LIBOR [Member]
Derivative [Line Items]
Principal amount	$ 90,000,000
Fair Value /Carrying Amount of Assets (Liability)	$ (8,965,000)
Weighted-Average Remaining Term (Years)	2 years 8 months 12 days
Fixed Interest Rate	4.90%
United States Dollar-denominated interest rate swaps 2 [Member] \| LIBOR [Member]
Derivative [Line Items]
Principal amount	$ 100,000,000
Fair Value /Carrying Amount of Assets (Liability)	$ (5,817,000)
Weighted-Average Remaining Term (Years)	1 year
Fixed Interest Rate	5.30%
United States Dollar-denominated interest rate swaps 3 [Member] \| LIBOR [Member]
Derivative [Line Items]
Principal amount	$ 168,750,000
Fair Value /Carrying Amount of Assets (Liability)	$ (34,567,000)
Weighted-Average Remaining Term (Years)	13 years
Fixed Interest Rate	5.20%
United States Dollar-denominated interest rate swaps 4 [Member] \| LIBOR [Member]
Derivative [Line Items]
Principal amount	$ 64,268,000
Fair Value /Carrying Amount of Assets (Liability)	$ (2,661,000)
Weighted-Average Remaining Term (Years)	5 years 7 months 6 days
Fixed Interest Rate	2.80%
United States Dollar-denominated interest rate swaps 5 [Member] \| LIBOR [Member]
Derivative [Line Items]
Principal amount	$ 320,000,000
Fair Value /Carrying Amount of Assets (Liability)	$ (15,112,000)
Weighted-Average Remaining Term (Years)	3 months 18 days
Fixed Interest Rate	2.90%
United States Dollar-denominated interest rate swaps 6 [Member] \| LIBOR [Member]
Derivative [Line Items]
Principal amount	$ 117,000,000
Fair Value /Carrying Amount of Assets (Liability)	$ (1,341,000)
Weighted-Average Remaining Term (Years)	3 years
Fixed Interest Rate	1.70%
Euro-denominated interest rate swaps [Member] \| EURIBOR [Member]
Derivative [Line Items]
Principal amount	$ 241,798,000
Fair Value /Carrying Amount of Assets (Liability)	$ (35,674,000)
Weighted-Average Remaining Term (Years)	5 years
Fixed Interest Rate	3.10%
Interest rate swap agreements [Member]
Derivative [Line Items]
Fair Value /Carrying Amount of Assets (Liability)	$ (104,137,000)

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

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

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- Definition

Fair value as of the balance sheet date of all derivative liabilities not designated as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959

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