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Significant Accounting Policies and Practices and Recent Accounting Pronouncements - Overhead Reimbursement Fees (Details) (HGI Energy Holdings, LLC, Compass, USD $) In Millions, unless otherwise specified | 7 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2014
HGI Energy Holdings, LLC | Compass |  |
Subsidiary or Equity Method Investee [Line Items] |  |
Results of Operations, General and Administrative Related to Oil and Gas Producing Activities | $ 4.3 | $ 7.5

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