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Impairment Charges and Reserves - Summary of Significant Unobservable Inputs (Detail) - Fair Value Measurements [Member] $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) $ / a | Dec. 31, 2017 USD ($) $ / a | Dec. 31, 2016 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Consolidated Assets, Fair Value | $ 51.5 | $ 307.1 | $ 215.7
Preferred Equity Interests, Fair Value | 185.5 | 272.0 |
Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Consolidated Assets, Fair Value | 51.5 | 307.1 | $ 215.7
Preferred Equity Interests, Fair Value | 185.5 | 272.0 |
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Indicative Bid [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Consolidated Assets, Fair Value | 351.2 |  |
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Consolidated Assets, Fair Value | $ 694.1 |  |
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] | Minimum [Member] | Measurement Input Market Capitalization Rate [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Unobservable inputs rate | 7.38% |  |
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Income Capitalization Approach [Member] | Maximum [Member] | Measurement Input Market Capitalization Rate [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Unobservable inputs rate | 9.34% |  |
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Discounted Cash Flow [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Consolidated Assets, Fair Value | $ 32.0 | $ 499.3 |
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Discounted Cash Flow [Member] | Measurement Input Discount Rate [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Unobservable inputs rate | 9.50% |  |
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Discounted Cash Flow [Member] | Minimum [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Terminal capitalization rate | 10.50% | 7.45% |
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Discounted Cash Flow [Member] | Minimum [Member] | Measurement Input Discount Rate [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Unobservable inputs rate |  | 7.75% |
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Discounted Cash Flow [Member] | Maximum [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Terminal capitalization rate | 21.40% | 21.39% |
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Discounted Cash Flow [Member] | Maximum [Member] | Measurement Input Discount Rate [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Unobservable inputs rate |  | 9.50% |
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Sales Comparison Approach [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Consolidated Assets, Fair Value | $ 2.2 | $ 7.4 |
Price per Acre, Range | $ / a | 35,000 |  |
Level 3 [Member] | Impairment of Consolidated Assets [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 |  | 50,000 |
Level 3 [Member] | Impairment of Consolidated Assets [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 |  | 218,000 |
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Indicative Bid/Contracted Price [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Consolidated Assets, Fair Value |  | $ 166.8 |
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Income Capitalization/Sales Comparison Approach [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Consolidated Assets, Fair Value |  | $ 882.6 |
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Income Capitalization/Sales Comparison Approach [Member] | Minimum [Member] | Measurement Input Market Capitalization Rate [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Unobservable inputs rate |  | 6.25% |
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Income Capitalization/Sales Comparison Approach [Member] | Maximum [Member] | Measurement Input Market Capitalization Rate [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Unobservable inputs rate |  | 10.00% |
Level 3 [Member] | Reserve of Preferred Equity Interests [Member] | Discounted Cash Flow [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Preferred Equity Interests, Fair Value | $ 185.5 | $ 272.0 |
NOI growth rate | 1.00% | 1.00% |
Level 3 [Member] | Reserve of Preferred Equity Interests [Member] | Discounted Cash Flow [Member] | Minimum [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Terminal capitalization rate | 7.90% | 7.80% |
Level 3 [Member] | Reserve of Preferred Equity Interests [Member] | Discounted Cash Flow [Member] | Minimum [Member] | Measurement Input Discount Rate [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Unobservable inputs rate | 8.40% | 8.40% |
Level 3 [Member] | Reserve of Preferred Equity Interests [Member] | Discounted Cash Flow [Member] | Maximum [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Terminal capitalization rate | 9.10% | 8.50% |
Level 3 [Member] | Reserve of Preferred Equity Interests [Member] | Discounted Cash Flow [Member] | Maximum [Member] | Measurement Input Discount Rate [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Unobservable inputs rate | 9.00% | 8.80% |

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