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Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]  
Actuarial losses before tax $ (22)
Tax benefit 9
Actuarial losses net of tax (13)
Selling, General and Administrative Expenses
 
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]  
Actuarial losses net of tax $ (13)