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Impairment Charges and Reserves - Summary of Significant Unobservable Inputs (Detail) $ in Millions | 6 Months Ended
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Jun. 30, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Consolidated Assets, Fair Value | $ 403.4
Preferred Equity Interests, Fair Value | 223.2
Fair Value Measurements [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Consolidated Assets, Fair Value | 403.4
Preferred Equity Interests, Fair Value | 223.2
Level 3 [Member] | Fair Value Measurements [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Consolidated Assets, Fair Value | 403.4
Preferred Equity Interests, Fair Value | 223.2
Impairment of Consolidated Assets [Member] | Level 3 [Member] | Indicative Bid [Member] | Fair Value Measurements [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Consolidated Assets, Fair Value | 162.4
Impairment of Consolidated Assets [Member] | Level 3 [Member] | Income Capitalization Approach [Member] | Fair Value Measurements [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Consolidated Assets, Fair Value | $ 241.0
Impairment of Consolidated Assets [Member] | Level 3 [Member] | Income Capitalization Approach [Member] | Fair Value Measurements [Member] | Minimum [Member] | Measurement Input Cap Rate [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Market capitalization rate | 7.40%
Impairment of Consolidated Assets [Member] | Level 3 [Member] | Income Capitalization Approach [Member] | Fair Value Measurements [Member] | Maximum [Member] | Measurement Input Cap Rate [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Market capitalization rate | 9.30%
Reserve of Preferred Equity Interests [Member] | Level 3 [Member] | Discounted Cash Flow [Member] | Fair Value Measurements [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Preferred Equity Interests, Fair Value | $ 223.2
NOI growth rate | 1.00%
Reserve of Preferred Equity Interests [Member] | Level 3 [Member] | Discounted Cash Flow [Member] | Fair Value Measurements [Member] | Minimum [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Terminal capitalization rate | 7.90%
Reserve of Preferred Equity Interests [Member] | Level 3 [Member] | Discounted Cash Flow [Member] | Fair Value Measurements [Member] | Minimum [Member] | Measurement Input Discount Rate [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Market capitalization rate | 8.40%
Reserve of Preferred Equity Interests [Member] | Level 3 [Member] | Discounted Cash Flow [Member] | Fair Value Measurements [Member] | Maximum [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Terminal capitalization rate | 8.40%
Reserve of Preferred Equity Interests [Member] | Level 3 [Member] | Discounted Cash Flow [Member] | Fair Value Measurements [Member] | Maximum [Member] | Measurement Input Discount Rate [Member] |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Market capitalization rate | 8.90%

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