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Asset Retirement Obligation - Additional Information (Detail) $ in Millions	Dec. 31, 2008 USD ($)
Asset Retirement Obligation Disclosure [Abstract]
Fair value of asset retirement obligations related to the legal requirements	$ 11.5

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- References

No definition available.

+ Details

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- Definition

Carrying amount of an asset that is legally restricted for purposes of settling an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

+ Details

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