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Weighted-Average Amortization Period for Intangible Assets Acquired (Eagle Rock) (Detail) (Eagle Rock, USD $) | 0 Months Ended
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Dec. 07, 2013
Business Acquisition [Line Items] |
Assets Acquired | $ 2,400
Noncompete Agreement |
Business Acquisition [Line Items] |
Assets Acquired | $ 2,400
Weighted-average Amortization Period (years) | 3 years

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
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Period Type: | duration

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration