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Impairment Charges and Reserves - Impairment Charges Measured at Fair Value on Non-Recurring Basis (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Preferred equity interests, Total Impairment Charges $ 11,422 $ 61,000 $ 0
Fair Value Measurements [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-lived assets held and used, Fair Value Measurements 51,500 307,100 215,700
Assets included in the spin-off of RVI, Fair Value Measurements 1,028,000 1,249,000 222,500
Preferred equity interests, Fair Value Measurements 185,500 272,000  
Long-lived assets held and used, Total Impairment Charges 6,700 73,300 67,400
Assets included in the spin-off of RVI, Total Impairment Charges 62,600 267,200 43,500
Preferred equity interests, Total Impairment Charges 11,400 61,000  
Fair Value Measurements [Member] | Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-lived assets held and used, Fair Value Measurements 0 0 0
Assets included in the spin-off of RVI, Fair Value Measurements 0 0 0
Preferred equity interests, Fair Value Measurements 0 0  
Fair Value Measurements [Member] | Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-lived assets held and used, Fair Value Measurements 0 0 0
Assets included in the spin-off of RVI, Fair Value Measurements 0 0 0
Preferred equity interests, Fair Value Measurements 0 0  
Fair Value Measurements [Member] | Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Long-lived assets held and used, Fair Value Measurements 51,500 307,100 215,700
Assets included in the spin-off of RVI, Fair Value Measurements 1,028,000 1,249,000 $ 222,500
Preferred equity interests, Fair Value Measurements $ 185,500 $ 272,000