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Accrued Warranty Costs - Changes in Product Warranty Obligation (Accrued Warranty Costs) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Accrued Warranty Costs [Line Items]
Balance at beginning of period	$ 6,172	$ 5,370
Amounts charged to costs and expenses	1,990	1,568
Costs incurred	(1,676)	(1,322)
Balance at end of period	$ 6,486	$ 5,616

- 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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