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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 | 6 Months Ended | 12 Months Ended
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Jun. 30, 2013 | Dec. 31, 2012
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Long-lived assets held and used and held for sale, Fair Value Measurements | $ 93.3 | $ 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 | 42.6 | 126.5
Unconsolidated joint venture investments, 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 and held for sale, Fair Value Measurements | 0 | 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 and held for sale, Fair Value Measurements | 0 | 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 and held for sale, Fair Value Measurements | 93.3 | 180.7
Unconsolidated joint venture investment, Fair Value Measurements |  | 4.7
Deconsolidated joint venture investment, Fair Value Measurements |  | $ 56.1

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- Definition Deconsolidated Joint Venture Investments Fair Value Disclosure + References No definition available. + Details
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- Definition Unconsolidated joint venture investments fair value. + References No definition available. + Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25351-111560 + Details
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