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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, 2016
Jun. 30, 2015
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning of period balance $ 714 $ 892
Additions charged to income 310 42
Warranty usage (28) (139)
Currency translation (18) (44)
End of period balance $ 978 $ 751