Summary of Significant Accounting Policies - Summary of Accrued Warranty Obligation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Abstract]
Balance at the beginning of the year	$ 4,252	$ 4,613	$ 4,554
Warranty expense	7,440	6,828	5,856
Warranty payments	(7,567)	(7,189)	(5,797)
Balance at the end of the period	$ 4,125	$ 4,252	$ 4,613