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Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Actuarial losses before taxes $ 22 $ 11 $ 67 $ 34
Tax benefit (8)   (27)  
Actuarial losses net of taxes 14 11 40 34
Selling, General and Administrative Expenses
       
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Actuarial losses net of taxes $ 14 $ 11 $ 40 $ 34