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Changes in Product Warranty Accrual (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Product Liability Contingency [Line Items]
Beginning Balance	$ 11,437	$ 11,936
Provision for warranties issued in current year	2,168	1,545
Walker acquisition	3,887
Payments	(1,922)	(1,136)
Ending Balance	$ 15,570	$ 12,345

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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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Total liability for standard and extended product warranties acquired in a business acquisition.

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Represents the aggregate decrease in the liability related to payments to satisfy claims for standard and extended product warranties.

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Represents the aggregate increase in the liability for accruals related to standard and extended product warranties issued during the reporting period.

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