Nature of Business and Summary of Significant Accounting Policies - Summary of Warranty Expense and Write-Off Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Balance at beginning of period	$ 8,415	$ 8,977	$ 9,653
Plus: Amounts charged to cost and expenses	2,998	3,103	4,051
Less: Deductions	(2,674)	(3,665)	(4,727)
Balance at end of period	$ 8,739	$ 8,415	$ 8,977