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Impairment Charges and Reserves - Impairment Charges Measured at Fair Value on Non-Recurring Basis (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-lived assets held and used, Fair Value Measurements $ 403,400  
Preferred equity interests, Fair Value Measurements 223,200  
Preferred equity interests, Total Losses 2,336 $ 76,000
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 403,400  
Preferred equity interests, Fair Value Measurements 223,200  
Long-lived assets held and used, Total Losses 48,500  
Preferred equity interests, Total Losses 2,300  
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  
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  
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 403,400  
Preferred equity interests, Fair Value Measurements $ 223,200