Gross Real Estate and Loan Activity (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Property
Dec. 31, 2013
Property
Long Lived Assets Held-for-sale [Line Items]    
Number of Real Estate Properties 12 [1] 11
Number of properties in real estate assets held for sale reported in continuing operations 145 145
Carrying value of properties in real estate assets held for sale reported in continuing operations $ 0.4 $ 0.4
Continuing Operations [Member]
   
Long Lived Assets Held-for-sale [Line Items]    
Number of Real Estate Properties 6  
Rental Properties $ 29.1  
[1] Includes six properties with a net carrying amount of $29.1 million in which its operating results are reported in continuing operations.