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Property, Plant and Equipment (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Oil and natural gas proved properties
Property, Plant and Equipment
Cumulative capitalized interest	$ 17.7	$ 11.7
Non-oil and natural gas equipment
Property, Plant and Equipment
Cumulative capitalized interest	$ 13.8	$ 11.4

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- 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

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- Details

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