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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, 2019
USD ($)
Dec. 31, 2018
USD ($)
$ / a
Dec. 31, 2017
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Consolidated Assets, Fair Value $ 5.0 $ 51.5 $ 307.1
Preferred Equity Interests, Fair Value 108.5 185.5 272.0
Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Consolidated Assets, Fair Value 5.0 51.5 307.1
Preferred Equity Interests, Fair Value 108.5 185.5 $ 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 5.0 351.2  
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  
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%  
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%  
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   $ 694.1  
Level 3 [Member] | Impairment of Consolidated Assets [Member] | Income Capitalization/Sales Comparison Approach [Member] | Minimum [Member] | Measurement Input Cap 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/Sales Comparison Approach [Member] | Maximum [Member] | Measurement Input Cap 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] | Sales Comparison Approach [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Consolidated Assets, Fair Value   $ 2.2  
Price per Acre | $ / a   35  
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 $ 108.5 $ 185.5  
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 8.30% 7.90%  
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 8.90% 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 9.40% 9.10%  
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 9.90% 9.00%