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Total Fixed Rate and Variable Rate Debt after Giving Effective to Interest Rate Derivatives (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Mortgage Loans on Real Estate [Line Items]    
Mortgages and notes payable $ 312,613 $ 217,104
Fixed Rate Residential Mortgage
   
Mortgage Loans on Real Estate [Line Items]    
Mortgages and notes payable 229,587 122,630
Adjustable Rate Residential Mortgage
   
Mortgage Loans on Real Estate [Line Items]    
Mortgages and notes payable $ 83,026 $ 94,474