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Schedule of Changes in Carrying Amount of Goodwill (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Goodwill and Intangible Assets Disclosure [Line Items]
Transfer of goodwill between segments	$ 20.6

Change in the carrying value of goodwill. The change could be the result of new goodwill acquired, goodwill impairment, if any, goodwill written off related to the sale of a business or other adjustments to goodwill.

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