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Summary of Significant Accounting Policies - Summary of Accrued Warranty Obligation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Product Warranty [Line Items]
Balance at the beginning of the year	$ 4,613	$ 4,554	$ 3,813
Warranty expense	6,828	5,856	6,427
Warranty payments	(7,189)	(5,797)	(5,686)
Balance at the end of the period	$ 4,252	$ 4,613	$ 4,554

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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