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Product Warranty - Reconciliation of Reserve for Warranty Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Beginning balance	$ 7,396	$ 8,241	$ 6,406	$ 7,539
Provision	(15)	190	3,895	4,335
Claims paid/costs incurred	(1,499)	(1,665)	(4,419)	(5,108)
Ending balance	$ 5,882	$ 6,766	$ 5,882	$ 6,766

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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