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Impairment Charges, Impairment of Joint Venture Investments and Reserves - Summary of Significant Unobservable Inputs (Detail) - Fair Value Measurements [Member] $ / ft² in Thousands, $ / a in Thousands, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) $ / a | Dec. 31, 2016 USD ($) $ / ft² | Dec. 31, 2015 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value | $ 1,556.1 | $ 438.2 | $ 407.1
Fair Value | 272.0 |  |
Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value | 1,556.1 | 438.2 | $ 407.1
Fair Value | 272.0 |  |
Impairment of Consolidated Assets [Member] | Level 3 [Member] | Indicative Bid/Contracted Price [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value | 166.8 | 13.4 |
Impairment of Consolidated Assets [Member] | Level 3 [Member] | Income Capitalization/Sales Comparison Approach [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value | $ 882.6 | $ 398.2 |
Impairment of Consolidated Assets [Member] | Level 3 [Member] | Income Capitalization/Sales Comparison Approach [Member] | Minimum [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Price per Square Foot, Range | $ / ft² |  | 15 |
Range | 6.25% | 7.00% |
Impairment of Consolidated Assets [Member] | Level 3 [Member] | Income Capitalization/Sales Comparison Approach [Member] | Maximum [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Price per Square Foot, Range | $ / ft² |  | 31 |
Range | 10.00% | 10.00% |
Impairment of Consolidated Assets [Member] | Level 3 [Member] | Indicative Bid [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value |  | $ 26.6 |
Impairment of Consolidated Assets [Member] | Level 3 [Member] | Discounted Cash Flow [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value | $ 499.3 |  |
Impairment of Consolidated Assets [Member] | Level 3 [Member] | Discounted Cash Flow [Member] | Minimum [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Range | 7.75% | 10.00% |
Range | 7.45% | 10.00% |
Impairment of Consolidated Assets [Member] | Level 3 [Member] | Discounted Cash Flow [Member] | Maximum [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Range | 9.50% | 11.00% |
Range | 21.39% | 12.00% |
Impairment of Consolidated Assets [Member] | Level 3 [Member] | Sales Comparison Approach [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value | $ 7.4 |  |
Impairment of Consolidated Assets [Member] | Level 3 [Member] | Sales Comparison Approach [Member] | Minimum [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Price per Acre, Range | $ / a | 50 |  |
Impairment of Consolidated Assets [Member] | Level 3 [Member] | Sales Comparison Approach [Member] | Maximum [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Price per Acre, Range | $ / a | 218 |  |
Reserve of Preferred Equity Interests [Member] | Level 3 [Member] | Discounted Cash Flow [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value | $ 272.0 |  |
Range | 1.00% |  |
Reserve of Preferred Equity Interests [Member] | Level 3 [Member] | Discounted Cash Flow [Member] | Minimum [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Range | 8.40% |  |
Range | 7.80% |  |
Reserve of Preferred Equity Interests [Member] | Level 3 [Member] | Discounted Cash Flow [Member] | Maximum [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Range | 8.80% |  |
Range | 8.50% |  |

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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=66048111&loc=d3e19207-110258 + Details
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