Roll Forward Of The Warranty Reserve (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Product Warranty [Line Items]
Beginning balance January 1	$ 4,417	$ 3,831	$ 4,383
Provision for warranties	5,398	4,648	4,331
Claim settlements	(5,214)	(4,443)	(4,665)
Other adjustments, including acquisitions and currency translation	274	381	(218)
Ending balance December 31	$ 4,875	$ 4,417	$ 3,831