9. Notes Receivable, Net (Detail) In Millions, unless otherwise specified	12 Months Ended	3 Months Ended
Dec. 31, 2012 USD ($)	Dec. 31, 2012 CNY	Mar. 15, 2013 Advance to Supplier [Member] USD ($)	Dec. 31, 2012 Haerbin City Ruixinda Investment Company Ltd. (the “Ruixinda” or “Purchaser”) [Member] Heilongjiang Feihe Yuanshengtai Co., Ltd. (“Yuanshengtai”) [Member]
Proceeds from Collection of Finance Receivables			$ 8
Equity Method Investment, Ownership Percentage				99.00%
Restructuring of Receivable from Sale of Productive Assets (in Yuan Renminbi)	32.1	200.0
Restructuring of Receivable from Sale of Productive Assets	$ 32.1	200.0

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 159

-Paragraph 18

-Subparagraph f

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 20

-Subparagraph a (1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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