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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 | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013
Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value | $ 67.0 | $ 75.5
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] | Income Capitalization Approach [Member] | Minimum [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range |  | 12.00
Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] | Maximum [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range |  | 117.00
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% |
Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] | Market Capitalization Rate [Member] | Minimum [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range |  | 8.00%
Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] | Market Capitalization Rate [Member] | Maximum [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range |  | 10.00%
Impairment of Consolidated Assets [Member] | Indicative Bid/Contracted Price [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value | 44.6 | 88.7
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] | Discounted Cash Flow [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value | $ 26.8 | $ 35.3
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] | Minimum [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range | 8.00% | 8.00%
Impairment of Joint Venture Investments [Member] | Discounted Cash Flow [Member] | Discount Rates [Member] | Maximum [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range | 15.00% | 15.00%
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 | 6.00% | 6.00%

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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=36462937&loc=d3e19207-110258 + Details
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