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Derivative Instruments - Interest Rate Swap Agreements (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
United States Dollar-denominated interest rate swaps 1 [Member]
Derivative [Line Items]
Interest Rate Index	LIBOR
Principal Amount	$ 412,880
Fair Value /Carrying Amount of Assets (Liability)	(110,590)
Weighted-Average Remaining Term (years)	24 years 1 month 6 days
Fixed Interest Rate (%)	4.90%
United States Dollar-denominated interest rate swaps 2 [Member]
Derivative [Line Items]
Interest Rate Index	LIBOR
Principal Amount	203,455
Fair Value /Carrying Amount of Assets (Liability)	(57,804)
Weighted-Average Remaining Term (years)	6 years 2 months 12 days
Fixed Interest Rate (%)	6.20%
United States Dollar-denominated interest rate swaps 3 [Member]
Derivative [Line Items]
Interest Rate Index	LIBOR
Principal Amount	90,000
Fair Value /Carrying Amount of Assets (Liability)	(17,937)
Weighted-Average Remaining Term (years)	5 years 8 months 12 days
Fixed Interest Rate (%)	4.90%
United States Dollar-denominated interest rate swaps 4 [Member]
Derivative [Line Items]
Interest Rate Index	LIBOR
Principal Amount	100,000
Fair Value /Carrying Amount of Assets (Liability)	(20,205)
Weighted-Average Remaining Term (years)	4 years
Fixed Interest Rate (%)	5.30%
United States Dollar-denominated interest rate swaps 5 [Member]
Derivative [Line Items]
Interest Rate Index	LIBOR
Principal Amount	206,250
Fair Value /Carrying Amount of Assets (Liability)	(56,355)
Weighted-Average Remaining Term (years)	16 years
Fixed Interest Rate (%)	5.20%
United States Dollar-denominated interest rate swaps 6 [Member]
Derivative [Line Items]
Interest Rate Index	LIBOR
Principal Amount	469,260
Fair Value /Carrying Amount of Assets (Liability)	165,687
Weighted-Average Remaining Term (years)	24 years 1 month 6 days
Fixed Interest Rate (%)	4.80%
Euro-denominated interest rate swaps [Member]
Derivative [Line Items]
Interest Rate Index	EURIBOR
Principal Amount	341,382
Fair Value /Carrying Amount of Assets (Liability)	(41,329)
Weighted-Average Remaining Term (years)	11 years 6 months
Fixed Interest Rate (%)	3.10%
Interest rate swap agreements [Member]
Derivative [Line Items]
Fair Value /Carrying Amount of Assets (Liability)	$ (138,533)

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

+ Details

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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- 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.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The reference rate for the variable rate of the interest rate derivative, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611



Reference 3: 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 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=7491637&loc=d3e13495-108611

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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