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Product Warranty Reserve - Roll Forward of Product Warranty Reserve (Detail) - Warranty Reserves [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning of period balance $ 1,076 $ 1,058
Additions charged to income 8 27
Warranty usage (16) (103)
Currency translation 4 31
End of period balance $ 1,072 $ 1,013