Other Current Liabilities - Schedule of Changes in Liability for Product Warranty Claims (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Liabilities Disclosure [Abstract]
Balance at beginning of the period	$ 11,702	$ 11,521
Satisfaction of warranty claims	(597)	(870)
Provision for warranty claims	1,013	1,019
Reversal of unneeded provision for warranty claims	(1,240)	0
Other, primarily impact from changes in foreign currency exchange rates	27	78
Balance at end of the period	$ 10,905	$ 11,748