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Warranty Obligations - Changes in Warranty Obligations (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Movement in Standard Product Warranty Accrual [Roll Forward]  
Beginning balance $ 4,701
Provisions for warranties issued during the period 3,376
Fulfillment of warranty obligations (3,223)
Foreign exchange rate changes (117)
Ending balance $ 4,737