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Impairment Charges and Impairment of Joint Venture Investments - Impairment Charges Measured at Fair Value on Non-Recurring Basis (Detail) (Fair Value Measurements [Member], USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Long-lived assets held and used, Fair Value Measurements	$ 161.4
Long-lived assets held and used and held for sale, Fair Value Measurements		180.7
Unconsolidated joint venture investment, Fair Value Measurements		4.7
Deconsolidated joint venture investment, Fair Value Measurements		56.1
Long-lived assets held and used and held for sale, Total Losses	66.8	126.5
Unconsolidated joint venture investment, Total Losses		26.7
Deconsolidated joint venture investment, Total Losses		9.3
Level 1 [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Long-lived assets held and used, Fair Value Measurements	0
Long-lived assets held and used and held for sale, Fair Value Measurements		0
Unconsolidated joint venture investment, Fair Value Measurements		0
Deconsolidated joint venture investment, Fair Value Measurements		0
Level 2 [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Long-lived assets held and used, Fair Value Measurements	0
Long-lived assets held and used and held for sale, Fair Value Measurements		0
Unconsolidated joint venture investment, Fair Value Measurements		0
Deconsolidated joint venture investment, Fair Value Measurements		0
Level 3 [Member]
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Long-lived assets held and used, Fair Value Measurements	161.4
Long-lived assets held and used and held for sale, Fair Value Measurements		180.7
Unconsolidated joint venture investment, Fair Value Measurements		4.7
Deconsolidated joint venture investment, Fair Value Measurements		$ 56.1

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Deconsolidated Joint Venture Investments Fair Value Disclosure

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- Definition

Long lived assets held and used and held for sale fair value.

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Long lived assets held and used fair value disclosure.

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- Definition

Gain (loss) included in earnings resulting from the sale of interest in projects.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 1

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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-Name Accounting Standards Codification

-Topic 320

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-Section 35

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-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25351-111560

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Fair value portion of investments in an entity not consolidated. Includes, but is not limited to, investments in an entity that is affiliated with the reporting entity by means of direct or indirect ownership, an entity in which the reporting entity shares control of the entity with another party or group, an entity which the company has significant influence, but does not have control and subsidiaries that are not required to be consolidated and are accounted for using the equity or cost method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258

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