Goodwill And Intangible Assets (Changes To Intangible Assets) (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 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		5,980
Disposals	(3,789)
Amortization expense	(9,767)	(21,646)
Currency translation and other	(1,205)	(743)
Balance at end of period, net of accumulated amortization	$ 131,466	$ 146,227