Goodwill And Intangible Assets (Changes To Intangible Assets) (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Goodwill And Intangible Assets [Line Items]
Balance at beginning of period, net of accumulated amortization	$ 146,227	$ 162,636
Additions	0	5,980
Disposals	(3,789)	0
Amortization expense	(13,987)	(21,646)
Currency translation and other	877	(743)
Balance at end of period, net of accumulated amortization	$ 129,328	$ 146,227