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Impairment Charges and Impairment of Joint Venture Investments - Summary of Significant Unobservable Inputs (Detail) (Fair Value Measurements [Member], USD $) In Millions, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Impairment of Consolidated Assets [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Unobservable Input | Price Per Square Foot | Price Per Square Foot
Impairment of Joint Venture Investments, Income Capitalization Approach [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Unobservable Input | Terminal Capitalization Rate | Terminal Capitalization Rate
Income Capitalization Approach [Member] | Impairment of Consolidated Assets [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value | $ 74.3 | $ 44.1
Valuation Technique | Income Capitalization Approach(B) | Income Capitalization Approach (B)
Unobservable Input | Market Capitalization Rate | Market Capitalization Rate
Income Capitalization Approach [Member] | Impairment of Joint Venture Investments, Income Capitalization Approach [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value | 0 | 4.7
Valuation Technique | Income Capitalization Approach | Income Capitalization Approach
Unobservable Input | Market Capitalization Rate | Market Capitalization Rate
Indicative Bid/Contracted Price [Member] | Impairment of Consolidated Assets [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value | 87.1 | 136.6
Valuation Technique | Indicative Bid(A) / Contracted Price | Indicative Bid (A) / Contracted Price
Unobservable Input | Indicative Bid(A) / Contracted Price | Indicative Bid (A) / Contracted Price
Discounted Cash Flow [Member] | Impairment of Joint Venture Investments, Income Capitalization Approach [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Valuation Technique | Discounted Cash Flow | Discounted Cash Flow
Unobservable Input | Discount Rate | Discount Rate
Discounted Cash Flow [Member] | Deconsolidated Joint Venture Investment, Discounted Cash Flow [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value | $ 0 | $ 56.1
Valuation Technique | Discounted Cash Flow | Discounted Cash Flow
Unobservable Input | Discount Rate | Discount Rate
Level 3 [Member] | Income Capitalization Approach [Member] | Impairment of Joint Venture Investments, Income Capitalization Approach [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range | 0.00% | 8.00%
Level 3 [Member] | Discounted Cash Flow [Member] | Impairment of Joint Venture Investments, Income Capitalization Approach [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range | 0.00% | 11.00%
Minimum [Member] | Level 3 [Member] | Impairment of Joint Venture Investments, Income Capitalization Approach [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range | 0.00% | 5.50%
Minimum [Member] | Level 3 [Member] | Income Capitalization Approach [Member] | Impairment of Consolidated Assets [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range | 7.70% | 8.00%
Range (per square foot) | 12 | 15
Minimum [Member] | Level 3 [Member] | Discounted Cash Flow [Member] | Deconsolidated Joint Venture Investment, Discounted Cash Flow [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range | 0.00% | 8.00%
Maximum [Member] | Level 3 [Member] | Impairment of Joint Venture Investments, Income Capitalization Approach [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range | 0.00% | 8.50%
Maximum [Member] | Level 3 [Member] | Income Capitalization Approach [Member] | Impairment of Consolidated Assets [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range | 10.00% | 12.00%
Range (per square foot) | 117 | 47
Maximum [Member] | Level 3 [Member] | Discounted Cash Flow [Member] | Deconsolidated Joint Venture Investment, Discounted Cash Flow [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range | 0.00% | 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 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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- Definition Description of the inputs and valuation technique(s) used to measure fair value. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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