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Suspended Exploratory Well Costs - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013 Well	Dec. 31, 2012	Dec. 31, 2011
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Capitalized exploratory well costs that have been capitalized for a period greater than one year	$ 6,964	$ 11,395	$ 9,528
Number of wells waiting on pipeline	1

X

- Definition

Number of wells waiting on pipeline.

+ References

No definition available.

+ Details

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X

- Definition

The amount of exploratory well costs that have been capitalized for a period of greater than one year after the completion of drilling.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 235

-Section 50

-Paragraph 1B

-Subparagraph b

-URI http://asc.fasb.org/extlink&oid=8451039&loc=SL6806780-109447

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