General (Details Textual) (USD $) In Millions, unless otherwise specified	9 Months Ended
Sep. 30, 2012	May 24, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business acquisition additional percentage of interest acquired by parent		14.00%
Prior period accrued environmental liabilities that were overstated	$ 6

Amount of each individual error being corrected in the correcting adjustment.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 250

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 1.N.Q3)

-URI http://asc.fasb.org/extlink&oid=26874127&loc=d3e30840-122693

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 1

-Section N

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration