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Impairment Charges and Reserves - Summary of Significant Unobservable Inputs (Detail)
$ in Millions
 6 Months Ended
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%