Other Current Liabilities - Schedule of Changes in Liability for Product Warranty Claims (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Liabilities Disclosure [Abstract]
Balance at the beginning of the year	$ 11,521	$ 6,358	$ 6,672
Acquisitions – opening balance sheet liability for warranty claims	0	7,130	0
Satisfaction of warranty claims	(4,014)	(4,297)	(2,452)
Provision for warranty claims	3,601	3,282	2,293
Other, primarily impact from changes in foreign currency exchange rates	594	(952)	(155)
Balance at the end of the year	$ 11,702	$ 11,521	$ 6,358