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Impairment Charges and Impairment of Joint Venture Investments - Impairment Charges on Assets or Investments (Parenthetical) (Detail)
 3 Months Ended
Mar. 31, 2015
ShoppingCenter
Jun. 30, 2015
Land
Operating Shopping Centers [Member]    
Schedule Of Investments [Line Items]    
Number of properties | ShoppingCenter 25  
Land Parcels [Member]    
Schedule Of Investments [Line Items]    
Number of properties   5
Minimum [Member]    
Schedule Of Investments [Line Items]    
Asset disposal period 12 months  
Maximum [Member]    
Schedule Of Investments [Line Items]    
Asset disposal period 24 months