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Inventories - Changes in Inventory Reserves (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Inventory Disclosure [Abstract]      
Balance at beginning of year $ 1,818 $ 1,767 $ 1,616
Provisions for losses 249 181 751
Write-offs and disposals (678) (130) (600)
Balance at end of year $ 1,389 $ 1,818 $ 1,767