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Impairment Charges and Impairment of Joint Venture Investments - Summary of Significant Unobservable Inputs (Detail) - Fair Value Measurements [Member] $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) $ / ft² | Dec. 31, 2014 USD ($)
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value | $ 407.1 | $ 141.2
Fair Value |  | 6.4
Level 3 [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value |  | $ 6.4
Impairment Of Consolidated Assets | Income Capitalization/Sales Comparison Approach [Member] | Level 3 [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range |  | 8.00%
Fair Value | $ 287.6 | $ 67.0
Impairment Of Consolidated Assets | Income Capitalization/Sales Comparison Approach [Member] | Level 3 [Member] | Minimum [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range | 8.00% |
Price per Square Foot, Range | $ / ft² | 10.00 |
Impairment Of Consolidated Assets | Income Capitalization/Sales Comparison Approach [Member] | Level 3 [Member] | Maximum [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range | 9.00% |
Price per Square Foot, Range | $ / ft² | 40.00 |
Impairment Of Consolidated Assets | Discounted Cash Flow [Member] | Level 3 [Member] | Minimum [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range | 10.00% |
Range | 8.00% |
Impairment Of Consolidated Assets | Discounted Cash Flow [Member] | Level 3 [Member] | Maximum [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range | 14.00% |
Range | 10.00% |
Impairment Of Consolidated Assets | Indicative Bid/Contracted Price [Member] | Level 3 [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value | $ 33.8 | $ 74.2
Impairment Of Consolidated Assets | Indicative Bid [Member] | Level 3 [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value | 51.5 |
Impairment Of Consolidated Assets | Indicative Bid/Sales Comparison Approach [Member] | Level 3 [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Fair Value | 34.2 |
Impairment Of Joint Venture Investments | Discounted Cash Flow [Member] | Level 3 [Member] |  |
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items] |  |
Range |  | 15.00%
Range |  | 6.00%
Fair Value | $ 0.0 | $ 6.4

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- Definition Ratio of the net operating income produced by an asset and its capital cost (original prices paid to buy the asset), used as an input 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=36462937&loc=d3e19207-110258 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + 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=36462937&loc=d3e19207-110258 + Details
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