XML 100 R84.htm IDEA: XBRL DOCUMENT v3.8.0.1
Impairment Charges, Impairment of Joint Venture Investments and Reserves - Impairment Charges Measured at Fair Value on Non-Recurring Basis (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment of joint venture investments $ 0 $ 0 $ 1,909
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 1,556,100 438,200 407,100
Preferred equity interests, Fair Value Measurements 272,000    
Unconsolidated joint venture investments, Fair Value Measurements     0
Long-lived assets held and used, Total Impairment Charges 340,500 110,900 279,000
Preferred equity interests, Total Impairment Charges 61,000    
Impairment of joint venture investments     1,900
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
Preferred equity interests, Fair Value Measurements 0    
Unconsolidated joint venture investments, 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 0 0
Preferred equity interests, Fair Value Measurements 0    
Unconsolidated joint venture investments, 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 1,556,100 $ 438,200 407,100
Preferred equity interests, Fair Value Measurements $ 272,000    
Unconsolidated joint venture investments, Fair Value Measurements     $ 0