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Asset Retirement Obligation (Narrative) (Detail) | 12 Months Ended
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Dec. 31, 2014
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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- Details
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Period Type: | duration

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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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Balance Type: | na
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