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Impairment Charges and Reserves - Impairment Charges Measured at Fair Value on Non-Recurring Basis (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-lived assets held and used, Fair Value Measurements $ 452,700  
Assets included in the spin-off of RVI, Fair Value Measurements 624,600  
Preferred equity interests, Fair Value Measurements 199,300  
Preferred equity interests, Total Losses 4,537 $ 60,623
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 452,700  
Assets included in the spin-off of RVI, Fair Value Measurements 624,600  
Preferred equity interests, Fair Value Measurements 199,300  
Long-lived assets held and used, Total Losses 54,300  
Assets included in the spin-off of RVI, Total Losses 14,100  
Preferred equity interests, Total Losses 4,500  
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  
Assets included in the spin-off of RVI, Fair Value Measurements 0  
Preferred equity interests, Fair Value Measurements 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  
Assets included in the spin-off of RVI, Fair Value Measurements 0  
Preferred equity interests, Fair Value Measurements 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 452,700  
Assets included in the spin-off of RVI, Fair Value Measurements 624,600  
Preferred equity interests, Fair Value Measurements $ 199,300