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Goodwill And Intangible Assets (Changes To Intangible Assets) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Goodwill And Intangible Assets [Line Items]
Balance at beginning of period, net of accumulated amortization	$ 125,913	$ 146,227
Disposals	0	(3,789)
Amortization expense	(4,178)	(16,907)
Currency translation and other	(3,170)	382
Balance at end of period, net of accumulated amortization	$ 118,565	$ 125,913

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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