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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

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