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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, 2017
Mar. 31, 2016
Valuation and Qualifying Accounts Disclosure [Line Items]    
Beginning of period balance $ 1,058 $ 714
Additions charged to income 27 3
Warranty usage (103) (41)
Currency translation 31 12
End of period balance $ 1,013 $ 688