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Inventories - Changes in Inventory Reserves (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Inventory Disclosure [Line Items]    
Balance at beginning of period $ 2,793 $ 1,783
Provision for (realization of) losses (284) 5
Write-offs and disposals (3) (83)
Balance at end of period $ 2,506 $ 1,705