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Basis of Presentation, Significant Accounting Polices and Practicies and Recent Accounting Pronouncements (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  |  | 3 Months Ended | 9 Months Ended
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Jun. 30, 2013 agreement | Jun. 30, 2013 EXCO/HGI JV [Member] Unproved oil and natural gas properties and development costs not being amortized [Member] | Feb. 14, 2013 EXCO/HGI JV [Member] Unproved oil and natural gas properties and development costs not being amortized [Member] | Jun. 30, 2013 HGI Energy Holdings, LLC [Member] EXCO/HGI JV [Member] | Jun. 30, 2013 HGI Energy Holdings, LLC [Member] EXCO/HGI JV [Member] | Jun. 30, 2013 HGI Energy Holdings, LLC [Member] EXCO/HGI JV [Member] Maximum [Member] Gas Gathering Assets [Member]
Reserve Quantities [Line Items] |  |  |  |  |  |
Oil and natural gas properties (full accounting method) |  | $ 49.8 | $ 48.5 |  |  |
Unproved oil and natural gas properties, expected period of evaluation and transfer to depletable portion |  |  |  |  | 4 years |
Unamortized costs exceed ceiling limitations |  |  |  | 211.2 |  |
Partnership, period used to determin expected future prices | 5 years |  |  |  |  |
Property, plant and equipment useful life |  |  |  |  |  | 14 years
Partnership, number of types of agreements generally sold | 2 |  |  |  |  |
Overhead charges |  |  |  | $ 1.8 | $ 2.4 |

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- Definition Unproved Oil and Natural Gas Properties, Expected Period of Evaluation and Transfer to Depletable Portion + References No definition available. + Details
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- Definition Capitalized costs of unproved properties incurred for any combination mineral interests acquisitions and other costs not previously disclosed within this table. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e61901-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Properties -URI http://asc.fasb.org/extlink&oid=21914647 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -Glossary Unproved Properties -URI http://asc.fasb.org/extlink&oid=6527831 + Details
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- Definition General and administrative costs from oil & gas producing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62136-109447 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=8451039&loc=d3e62299-109447 + Details
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- Definition The excess of unamortized costs capitalized within a cost center, less related deferred income taxes, over the cost center ceiling limitation, which is charged to expense for oil and gas producing companies that use full cost method of accounting for investments in oil and gas producing properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph c -Subparagraph 4(ii) -Article 4 + Details
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