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Asset Retirement Obligation (Narrative) (Detail)	12 Months Ended
	Dec. 31, 2015
Asset Retirement Obligation [Line Items]
Asset Retirement Obligations Description	Due to the high rate of lease renewals over a long period of time, the calculation assumes that all related assets will be removed at some period over the next 50 years.

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- Definition

Asset Retirement Obligation [Line Items]

+ References

No definition available.

+ Details

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- Definition

A general description of the asset retirement obligations and the associated long-lived assets. Description may include the terms of the legal restriction.

+ 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 (a)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

+ Details

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