XML 91 R66.htm IDEA: XBRL DOCUMENT v2.4.0.6

Property, Plant and Equipment (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Oil and natural gas proved properties
Property, Plant and Equipment [Line Items]
Cumulative capitalized interest	$ 14.7	$ 11.7
Non-oil and natural gas equipment
Property, Plant and Equipment [Line Items]
Cumulative capitalized interest	$ 12.4	$ 11.4

X

- Definition

Amount of accumulated interest costs capitalized as part of property, plant and equipment cost basis.

+ References

No definition available.

+ Details

Name:	us-gaap_AccumulatedCapitalizedInterestCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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