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Inventories - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Inventory Disclosure [Abstract]        
Amounts (debited) credited to the allowance for obsolete inventory $ (2) $ 26 $ 67 $ 82