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Commitments and Contingent Liabilities - Summary of Changes in Product Warranty/Liability Reserve (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of changes in product warranties reserve:
Warranty reserve, beginning of year	$ 64,008	$ 69,787	$ 64,417
Provision	41,138	37,040	44,633
Payments	(42,404)	(42,819)	(39,263)
Warranty reserve, end of year	$ 62,742	$ 64,008	$ 69,787

- 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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