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Location In Financial Statements of Gain Or Loss Recognized on Interest Rate Derivatives Designated as Cash Flow Hedges (Detail) (Interest Rate Swap, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Interest Rate Swap
 
Derivative Instruments, Gain (Loss) [Line Items]  
Gain (loss) recognized in accumulated other comprehensive income on derivative financial instruments (effective portion) $ (786)
Gain (loss) reclassified from accumulated other comprehensive income to interest expense (effective portion) (147)
Gain (loss) recognized in gain (loss) on derivative financial instruments (ineffective portion and amounts excluded from effectiveness testing) $ (2)