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Reconciliation of Reserve for Warranty Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Product Liability Contingency [Line Items]
Beginning balance	$ 8,262	$ 8,646	$ 8,140	$ 8,427
Provision	1,919	6,234	3,773	8,185
Claims paid/costs incurred	(2,318)	(2,898)	(4,050)	(4,630)
Ending balance	$ 7,863	$ 11,982	$ 7,863	$ 11,982

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. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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