Product Warranty Accrual Included in Other Accrued Liabilities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Other Accrued Liabilities [Line Items]
Balance as of January 1	$ 19,709	$ 15,462
Provision for warranties issued in current year	6,601	9,714
Provision for (Recovery of ) pre-existing warranties	560	(409)
Payments	(6,350)	(5,058)
Balance as of December 31	$ 20,520	$ 19,709