Warranty Costs - Changes in Carrying Amount of Accrued Product Warranty Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward]
Balance at beginning of period	$ 9,468	$ 7,792	$ 8,739
Accrued current period warranty expense	1,355	4,429	1,537
Acquired warranty reserve	1,636
Payments and adjustments	(3,301)	(2,753)	(2,484)
Balance at end of period	$ 9,158	$ 9,468	$ 7,792