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Fair Value Fixed-Rate Debt (Detail) (Market Approach Valuation Technique, Fair Value, Inputs, Level 2, Fixed Rate Debt, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Market Approach Valuation Technique | Fair Value, Inputs, Level 2 | Fixed Rate Debt
   
Debt Instrument [Line Items]    
Carrying Value $ 188,565 $ 122,830
Fair Value $ 193,448 $ 122,950