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Impairment Charges and Reserves - Summary of Significant Unobservable Inputs (Detail) - Fair Value Measurements [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Consolidated Assets, Fair Value $ 11.5 $ 10.0 $ 5.0
Preferred equity interests, Fair Value 94.2   108.5
Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Consolidated Assets, Fair Value 11.5 10.0 5.0
Preferred equity interests, Fair Value 94.2   $ 108.5
Preferred Equity Interests | Level 3 [Member] | Valuation Technique, Discounted Cash Flow      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Preferred equity interests, Fair Value $ 94.2    
Preferred Equity Interests | Level 3 [Member] | Valuation Technique, Discounted Cash Flow | Discount Rate [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Unobservable inputs rate 7.90%    
Preferred Equity Interests | Level 3 [Member] | Valuation Technique, Discounted Cash Flow | Discount Rate [Member] | Minimum [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Unobservable inputs rate 6.60%    
Preferred Equity Interests | Level 3 [Member] | Valuation Technique, Discounted Cash Flow | Discount Rate [Member] | Maximum [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Unobservable inputs rate 10.60%    
Preferred Equity Interests | Level 3 [Member] | Valuation Technique, Discounted Cash Flow | Terminal Capitalization Rate [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Unobservable inputs rate 8.20%    
Preferred Equity Interests | Level 3 [Member] | Valuation Technique, Discounted Cash Flow | Terminal Capitalization Rate [Member] | Minimum [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Unobservable inputs rate 6.60%    
Preferred Equity Interests | Level 3 [Member] | Valuation Technique, Discounted Cash Flow | Terminal Capitalization Rate [Member] | Maximum [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Unobservable inputs rate 10.50%    
Preferred Equity Interests | Level 3 [Member] | Valuation Technique, Discounted Cash Flow | NOI Growth Rate [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Unobservable inputs rate 0.00%    
Preferred Equity Interests | Level 3 [Member] | Valuation Technique, Discounted Cash Flow | NOI Growth Rate [Member] | Minimum [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Unobservable inputs rate 0.00%    
Preferred Equity Interests | Level 3 [Member] | Valuation Technique, Discounted Cash Flow | NOI Growth Rate [Member] | Maximum [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Unobservable inputs rate 0.00%    
Impairment of Consolidated Assets [Member] | Level 3 [Member] | Indicative Bid [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Consolidated Assets, Fair Value $ 11.5 $ 10.0