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Product Warranty Reserve - Roll Forward of Product Warranty Reserve (Detail) (Warranty Reserves [Member], USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Warranty Reserves [Member]
    
Valuation and Qualifying Accounts Disclosure [Line Items]    
Balance at the beginning of period $ 1,229 $ 824
Additions charged to income 241 769
Warranty usage (218) (401)
Currency translation (32) (3)
End of period balance $ 1,220 $ 1,189