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Impairment Charges and Reserves - Impairment Charges and Reserves Measured at Fair Value on Non-Recurring Basis (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-lived assets held and used, Total Impairment Charges $ 3,200 $ 600 $ 5,800
Preferred equity interests, Total Impairment Charges 19,393 15,544 11,422
Fair Value Measurements [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets included in the spin-off of RVI, Fair Value Measurements     1,028,000
Long-lived assets held and used, Fair Value Measurements 11,500 5,000 51,500
Preferred equity interests, Fair Value Measurements 94,200 108,500 185,500
Assets included in the spin-off of RVI, Total Impairment Charges     62,600
Long-lived assets held and used, Total Impairment Charges 5,200 3,400 6,700
Preferred equity interests, Total Impairment Charges 19,400 15,500 11,400
Fair Value Measurements [Member] | Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets included in the spin-off of RVI, Fair Value Measurements     0
Long-lived assets held and used, Fair Value Measurements 0 0 0
Preferred equity interests, Fair Value Measurements 0 0 0
Fair Value Measurements [Member] | Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets included in the spin-off of RVI, Fair Value Measurements     0
Long-lived assets held and used, Fair Value Measurements 0 0 0
Preferred equity interests, Fair Value Measurements 0 0 0
Fair Value Measurements [Member] | Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets included in the spin-off of RVI, Fair Value Measurements     1,028,000
Long-lived assets held and used, Fair Value Measurements 11,500 5,000 51,500
Preferred equity interests, Fair Value Measurements $ 94,200 $ 108,500 $ 185,500