<?xml version="1.0" encoding="utf-8"?>
<FilingSummary xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <Version>2.4.0.6</Version>
  <ProcessingTime />
  <ReportFormat>Html</ReportFormat>
  <ContextCount>174</ContextCount>
  <ElementCount>315</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>66</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>7</UnitCount>
  <MyReports>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>00 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/DocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
    </Report>
    <Report>
      <IsDefault>true</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0110 - Statement - Condensed Consolidated Balance Sheets (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/StatementOfBalanceSheets</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>0111 - Statement - Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/BalanceSheetsParenthetical</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>0120 - Statement - Condensed Consolidated Statements of Operations (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/StatementsOfOperations</Role>
      <ShortName>Condensed Consolidated Statements of Operations (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>0130 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/CashFlow</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>0131 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/StatementsOfCashFlows</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>0140 - Statement - Condensed Consolidated Statement of Changes in Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/StatementOfChangesInStockholdersEquity</Role>
      <ShortName>Condensed Consolidated Statement of Changes in Stockholders' Equity</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>0201 - Disclosure - Organization and Nature of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/OrganizationAndNatureOfOperations</Role>
      <ShortName>Organization and Nature of Operations</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>0202 - Disclosure - Current Plan of Operations and Ability to Operate as a Going Concern</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/CurrentPlanOfOperationsAndAbilityToOperateAsGoingConcern</Role>
      <ShortName>Current Plan of Operations and Ability to Operate as a Going Concern</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>0203 - Disclosure - Acquisition</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/AcquisitionsAndDivestitures</Role>
      <ShortName>Acquisition</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>0204 - Disclosure - Fair Value of Financial Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/FairValueOfFinancialInstruments</Role>
      <ShortName>Fair Value of Financial Instruments</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>0205 - Disclosure - Notes Payable</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://greenhunterenergy.com/role/NotesPayable</Role>
      <ShortName>Notes Payable</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>0206 - Disclosure - Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/StockholdersEquity</Role>
      <ShortName>Stockholders' Equity</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>0207 - Disclosure - Share-Based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/StockBasedCompensation</Role>
      <ShortName>Share-Based Compensation</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>0208 - Disclosure - Related Party Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/RelatedPartyTransactions</Role>
      <ShortName>Related Party Transactions</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>0209 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/CommitmentsAndContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>0210 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/SubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>0501 - Disclosure - Organization and Nature of Operations (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/OrganizationAndNatureOfOperationsTables</Role>
      <ShortName>Organization and Nature of Operations (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>0503 - Disclosure - Acquisition (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/AcquisitionTables</Role>
      <ShortName>Acquisition (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>0504 - Disclosure - Fair Value of Financial Instruments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/FairValueOfFinancialInstrumentsTables</Role>
      <ShortName>Fair Value of Financial Instruments (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>0505 - Disclosure - Notes Payable (Tables)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://greenhunterenergy.com/role/NotesPayableTables</Role>
      <ShortName>Notes Payable (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>0506 - Disclosure - Stockholders' Equity (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/StockholdersEquityTables</Role>
      <ShortName>Stockholders' Equity (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>0507 - Disclosure - Share-Based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/ShareBasedCompensationTables</Role>
      <ShortName>Share-Based Compensation (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>0601 - Disclosure - Organization and Nature of Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/OrganizationAndNatureOfOperationsDetails</Role>
      <ShortName>Organization and Nature of Operations (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>0602 - Disclosure - Current Plan of Operations and Ability to Operate as a Going Concern (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/CurrentPlanOfOperationsAndAbilityToOperateAsGoingConcernDetails</Role>
      <ShortName>Current Plan of Operations and Ability to Operate as a Going Concern (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>0603 - Disclosure - Acquisition (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/AcquisitionDetails</Role>
      <ShortName>Acquisition (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>06031 - Disclosure - Acquisition (Details 1)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/AcquisitionDetails1</Role>
      <ShortName>Acquisition (Details 1)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>06032 - Disclosure - Acquisition (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/AcquisitionDetailsTextual</Role>
      <ShortName>Acquisition (Details Textual)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>0604 - Disclosure - Fair Value of Financial Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/FairValueOfFinancialInstrumentsDetails</Role>
      <ShortName>Fair Value of Financial Instruments (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>06041 - Disclosure - Fair Value of Financial Instruments (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/FairValueOfFinancialInstrumentsDetails1</Role>
      <ShortName>Fair Value of Financial Instruments (Details Textual)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>0605 - Disclosure - Notes Payable (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://greenhunterenergy.com/role/NotesPayableDetails</Role>
      <ShortName>Notes Payable (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>06051 - Disclosure - Notes Payable (Details 1)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://greenhunterenergy.com/role/NotesPayableDetails1</Role>
      <ShortName>Notes Payable (Details 1)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>06052 - Disclosure - Notes Payable (Details Textual)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://greenhunterenergy.com/role/NotesPayableDetailsTextual</Role>
      <ShortName>Notes Payable (Details Textual)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>0606 - Disclosure - Stockholders' Equity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/StockholdersEquityDetails</Role>
      <ShortName>Stockholders' Equity (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>06061 - Disclosure - Stockholders' Equity (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/StockholdersEquityDetailsTextual</Role>
      <ShortName>Stockholders' Equity (Details Textual)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>0607 - Disclosure - Share-Based Compensation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/ShareBasedCompensationDetails</Role>
      <ShortName>Share-Based Compensation (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>06071 - Disclosure - Share-Based Compensation (Details 1)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/ShareBasedCompensationDetails1</Role>
      <ShortName>Share-Based Compensation (Details 1)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>06072 - Disclosure - Share-Based Compensation (Details 2)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/ShareBasedCompensationDetails2</Role>
      <ShortName>Share-Based Compensation (Details 2)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>06073 - Disclosure - Share-Based Compensation (Details 3)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/ShareBasedCompensationDetails3</Role>
      <ShortName>Share-Based Compensation (Details 3)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>06074 - Disclosure - Share-Based Compensation (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/ShareBasedCompensationDetailsTextual</Role>
      <ShortName>Share-Based Compensation (Details Textual)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>0608 - Disclosure - Related Party Transactions (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/RelatedPartyTransactionsDetails</Role>
      <ShortName>Related Party Transactions (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>0609 - Disclosure - Commitments and Contingencies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/CommitmentsAndContingenciesDetails</Role>
      <ShortName>Commitments and Contingencies (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>0610 - Disclosure - Subsequent Events (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://greenhunterenergy.com/role/SubsequentEventsDetails</Role>
      <ShortName>Subsequent Events (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <Logs>
    <Log type="Info">Element grh_AmountDueForServiceRenderByPlaintiff had a mix of decimals attribute values: -5 -3.</Log>
    <Log type="Info">Element grh_BusinessAcquisitionProformaNetIncomeLossPerShareBasicAndDiluted had a mix of decimals attribute values: 0 2.</Log>
    <Log type="Info">Element grh_ConvertiblePromissoryNoteValue had a mix of decimals attribute values: -5 0.</Log>
    <Log type="Info">Element grh_PromissoryNotesOutstanding had a mix of decimals attribute values: -5 -3.</Log>
    <Log type="Info">Element us-gaap_BusinessAcquisitionCostOfAcquiredEntityCashPaid had a mix of decimals attribute values: -5 0.</Log>
    <Log type="Info">Element us-gaap_BusinessAcquisitionCostOfAcquiredEntityPurchasePrice had a mix of decimals attribute values: -5 0.</Log>
    <Log type="Info">Element us-gaap_DebtConversionOriginalDebtAmount1 had a mix of decimals attribute values: -3 0.</Log>
    <Log type="Info">Element us-gaap_DividendsPreferredStock had a mix of decimals attribute values: -5 0.</Log>
    <Log type="Info">Element us-gaap_OperatingLeasesIncomeStatementLeaseRevenue had a mix of decimals attribute values: -5 -3 0.</Log>
    <Log type="Info">Element us-gaap_ProceedsFromNotesPayable had a mix of decimals attribute values: -5 0.</Log>
    <Log type="Info">Element us-gaap_RepaymentsOfNotesPayable had a mix of decimals attribute values: -3 0.</Log>
    <Log type="Info">Element us-gaap_TreasuryStockValue had a mix of decimals attribute values: -3 0.</Log>
    <Log type="Info">'Monetary' elements on report '0602 - Disclosure - Current Plan of Operations and Ability to Operate as a Going Concern (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '06032 - Disclosure - Acquisition (Details Textual)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '06052 - Disclosure - Notes Payable (Details Textual)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '06061 - Disclosure - Stockholders' Equity (Details Textual)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '06074 - Disclosure - Share-Based Compensation (Details Textual)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '0609 - Disclosure - Commitments and Contingencies (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '0610 - Disclosure - Subsequent Events (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">Process Flow-Through: 0110 - Statement - Condensed Consolidated Balance Sheets (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 0111 - Statement - Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical)</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Feb. 17, 2012'</Log>
    <Log type="Info">Process Flow-Through: 0120 - Statement - Condensed Consolidated Statements of Operations (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 0130 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited)</Log>
    <Log type="Info">Process Flow-Through: 0131 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical)</Log>
  </Logs>
  <InputFiles>
    <File>grh-20120630.xml</File>
    <File>grh-20120630.xsd</File>
    <File>grh-20120630_cal.xml</File>
    <File>grh-20120630_def.xml</File>
    <File>grh-20120630_lab.xml</File>
    <File>grh-20120630_pre.xml</File>
  </InputFiles>
  <SupplementalFiles />
  <BaseTaxonomies />
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
