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Impairment Charges and Impairment of Joint Venture Investments - Summary of Significant Unobservable Inputs (Detail) (Level 3 [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Impairment of consolidated assets, Income Capitalization Approach [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value |  | $ 44.1
Valuation Technique |  | Income Capitalization Approach
Unobservable Input |  | Market Capitalization Rate
Impairment of consolidated assets, Income Capitalization Approach [Member] | Fair Value Measurements [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Unobservable Input |  | Price Per Square Foot
Impairment of consolidated assets, Indicative Bid [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value | 22.0 | 136.6
Valuation Technique | Indicative Bid | Indicative Bid
Unobservable Input | Indicative Bid | Indicative Bid
Range |  |
Impairment of consolidated assets - Held for Sale, Contracted Price [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value | 7.3 |
Valuation Technique | Contracted Price |
Unobservable Input | Contracted Price |
Range |  |
Impairment of joint venture investments, Income Capitalization Approach [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value |  | 4.7
Valuation Technique |  | Income Capitalization Approach
Unobservable Input |  | Market Capitalization Rate
Range |  | 8.00%
Impairment of joint venture investments, Discounted Cash Flow [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value |  | 0
Valuation Technique |  | Discounted Cash Flow
Unobservable Input |  | Discount Rate
Range |  | 11.00%
Impairment of joint venture investments, Discounted Cash Flow [Member] | Fair Value Measurements [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Unobservable Input |  | Terminal Capitalization Rate
Deconsolidated joint venture investment, Discounted Cash Flow [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value |  | $ 56.1
Valuation Technique |  | Discounted Cash Flow
Unobservable Input |  | Discount Rate
Minimum [Member] | Impairment of consolidated assets, Income Capitalization Approach [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range |  | 8.00%
Minimum [Member] | Impairment of consolidated assets, Income Capitalization Approach [Member] | Fair Value Measurements [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range (per square foot) |  | 15
Minimum [Member] | Impairment of joint venture investments, Discounted Cash Flow [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range |  | 5.50%
Minimum [Member] | Deconsolidated joint venture investment, Discounted Cash Flow [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range |  | 8.00%
Maximum [Member] | Impairment of consolidated assets, Income Capitalization Approach [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range |  | 12.00%
Maximum [Member] | Impairment of consolidated assets, Income Capitalization Approach [Member] | Fair Value Measurements [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range (per square foot) |  | 47
Maximum [Member] | Impairment of joint venture investments, Discounted Cash Flow [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range |  | 8.50%
Maximum [Member] | Deconsolidated joint venture investment, Discounted Cash Flow [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range |  | 15.00%

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- Definition Unobservable inputs used in fair value measurements of non-recurring items. + References No definition available. + Details
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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