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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 | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 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 | $ 26.6 | $ 44.1
Valuation Technique | Income Capitalization Approach | Income Capitalization Approach
Unobservable Input | Market Capitalization Rate | 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 | Price Per Square Foot
Impairment of consolidated assets, Indicative Bid/Contracted Price [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value | 64.7 |
Valuation Technique | Indicative Bid / Contracted Price |
Unobservable Input | Indicative Bid / Contracted Price |
Range |  |
Impairment of consolidated assets - Held for Sale, Contracted Price [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value | 2.0 |
Valuation Technique | Contracted Price |
Unobservable Input | Contracted Price |
Range |  |
Impairment of consolidated assets, Indicative Bid [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value |  | 136.6
Valuation Technique |  | Indicative Bid
Unobservable Input |  | Indicative Bid
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 | 7.50% | 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) | 12 | 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 | 16.10% | 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) | 49 | 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 Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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=25499696&loc=d3e19207-110258 + Details
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