Reconciliation of Changes in Accrued Warranty Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Balance at beginning of year	$ 5,382	$ 5,443
Warranty claims paid	(905)	(979)
Warranty expense for products shipped during the current period	2,678	3,162
Adjustments to warranty estimates from prior periods	(608)	(2,655)
Reclassification to liabilities held for sale	(1,884)
Adjustment due to currency translation	(149)	411
Balance at end of year	$ 4,514	$ 5,382