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Product Warranty Reserve - Roll Forward of Product Warranty Reserve (Detail) - Warranty Reserves [Member] - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning of period balance $ 892 $ 1,140
Additions charged to income 42 155
Warranty usage (139) (75)
Currency translation (44) 20
End of period balance $ 751 $ 1,240