v2.4.0.6

Properties, Plants and Equipment - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2011
Refining Facilities [Member]
Property, Plant and Equipment [Line Items]
Refining manufacturing facilities, useful life, general	25 years
Pipeline Assets [Member]
Property, Plant and Equipment [Line Items]
Refining manufacturing facilities, useful life, general	45 years

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration