Property, Plant and Equipment, Useful Life (Details)	12 Months Ended
Dec. 31, 2011 years
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life, Maximum	40
Property, Plant and Equipment, Useful Life, Minimum	15
Property, Plant and Equipment, Useful Life, Acquired Asset, Maximum	30
Property, Plant and Equipment, Useful Life, Acquired Asset, Minimum	10

The maximum useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration