Changes in Product Warranty Reserve (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Warranties [Line Items]
Balance at beginning of period	$ 58,212	$ 50,640
Warranty expense	4,773	5,404
Acquisitions	1,776
Warranty claim payments	(4,713)	(3,460)
Foreign currency impact/other	(750)	1,121
Balance at end of period	$ 59,298	$ 53,705