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Financial Instruments - Summary of Effects of Interest Rate Swap (Detail) (Interest Rate Swap [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Interest Rate Swap [Member]
       
Derivatives, Fair Value [Line Items]        
Gain (loss) Recognized in AOCL, net of tax $ 78 $ (50) $ 143 $ (93)
Loss Reclassified from AOCL into Expense $ 114 $ 95 $ 225 $ 185