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Note 11. Business Segments and Significant Customers (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011
Derivative, Gain on Derivative | $ 38.0
Foward Contracts For Lead And Zinc [Member] |
Derivative, Gain on Derivative | $ 7.1

X
- Definition Increase in the fair value of the derivative or group of derivatives included in earnings in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5618551-113959 + Details
Name: | us-gaap_DerivativeGainOnDerivative
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration