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Impairment Charges and Impairment of Joint Venture Investments - Summary of Significant Unobservable Inputs (Detail) (Level 3 [Member], Fair Value Measurements [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value | $ 75.5 | $ 44.1
Valuation Technique | Income Capitalization Approach | Income Capitalization Approach
Unobservable Input | Market Capitalization Rate | Market Capitalization Rate
Unobservable Input | Price Per Square Foot | Price Per Square Foot
Impairment of Consolidated Assets [Member] | Indicative Bid/Contracted Price [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value | 85.7 | 136.6
Valuation Technique | Indicative Bid/ Contracted Price | Indicative Bid/ Contracted Price
Unobservable Input | Indicative Bid/ Contracted Price | Indicative Bid/ Contracted Price
Impairment of Joint Venture Investments [Member] | Income Capitalization Approach [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value | 35.3 | 4.7
Valuation Technique | Income Capitalization Approach | Income Capitalization Approach
Unobservable Input | Market Capitalization Rate | Market Capitalization Rate
Range |  | 8.00%
Impairment of Joint Venture Investments [Member] | Discounted Cash Flow [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value | 35.3 | 4.7
Valuation Technique | Discounted Cash Flow | Discounted Cash Flow
Unobservable Input | Discount Rate | Discount Rate
Unobservable Input | Terminal Capitalization Rate | Terminal Capitalization Rate
Impairment of Joint Venture Investments [Member] | Discounted Cash Flow [Member] | Discount Rates [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range |  | 11.00%
Impairment of Joint Venture Investments [Member] | Discounted Cash Flow [Member] | Terminal Capitalization Rate [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range |  |
Deconsolidated Joint Venture Investment [Member] | 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
Deconsolidated Joint Venture Investment [Member] | Discounted Cash Flow [Member] | Discount Rates [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range |  |
Impairment of Consolidated Assets - Held for Sale [Member] | Indicative Bid [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value | $ 3.0 | $ 0
Valuation Technique | Indicative Bid | Indicative Bid
Unobservable Input | Indicative Bid | Indicative Bid
Minimum [Member] | Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] | Market Capitalization Rate [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range | 8.00% | 8.00%
Minimum [Member] | Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] | Price Per Square Foot [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 [Member] | Discounted Cash Flow [Member] | Discount Rates [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range | 8.00% |
Minimum [Member] | Impairment of Joint Venture Investments [Member] | Discounted Cash Flow [Member] | Terminal Capitalization Rate [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range |  | 5.50%
Minimum [Member] | Deconsolidated Joint Venture Investment [Member] | Discounted Cash Flow [Member] | Discount Rates [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range |  | 8.00%
Maximum [Member] | Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] | Market Capitalization Rate [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range | 10.00% | 12.00%
Maximum [Member] | Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] | Price Per Square Foot [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range (per square foot) | 117 | 47
Maximum [Member] | Impairment of Joint Venture Investments [Member] | Discounted Cash Flow [Member] | Discount Rates [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range | 15.00% |
Maximum [Member] | Impairment of Joint Venture Investments [Member] | Discounted Cash Flow [Member] | Terminal Capitalization Rate [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range |  | 8.50%
Maximum [Member] | Deconsolidated Joint Venture Investment [Member] | Discounted Cash Flow [Member] | Discount Rates [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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