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          <Units>
            <Unit>
              <UnitID>USD</UnitID>
              <UnitType>Standard</UnitType>
              <StandardMeasure>
                <MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema>
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                <MeasureNamespace>iso4217</MeasureNamespace>
              </StandardMeasure>
              <Scale>0</Scale>
            </Unit>
          </Units>
          <CurrencySymbol>$</CurrencySymbol>
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      </OriginalInstanceReportColumns>
      <ElementDataType />
      <SimpleDataType>na</SimpleDataType>
      <ElementDefenition>No definition available.</ElementDefenition>
      <ElementReferences>No authoritative reference available.</ElementReferences>
      <IsTotalLabel>false</IsTotalLabel>
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    <Row>
      <Id>11</Id>
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      <Level>2</Level>
      <ElementName>ghl_ContingentConvertiblePreferredStockParOrStatedValuePerShare</ElementName>
      <ElementPrefix>ghl</ElementPrefix>
      <IsBaseElement>false</IsBaseElement>
      <BalanceType>na</BalanceType>
      <PeriodType>instant</PeriodType>
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      <IsSegmentTitle>false</IsSegmentTitle>
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      <IsCalendarTitle>false</IsCalendarTitle>
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      <PreferredLabelRole>verboselabel</PreferredLabelRole>
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      <FootnoteIndexer />
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        <Cell>
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          <ShowCurrencySymbol>false</ShowCurrencySymbol>
          <IsNumeric>true</IsNumeric>
          <IsRatio>false</IsRatio>
          <DisplayZeroAsNone>false</DisplayZeroAsNone>
          <NumericAmount>0.01</NumericAmount>
          <RoundedNumericAmount>0.01</RoundedNumericAmount>
          <NonNumbericText />
          <NonNumericTextHeader />
          <FootnoteIndexer />
          <hasSegments>false</hasSegments>
          <hasScenarios>false</hasScenarios>
          <DisplayDateInUSFormat>false</DisplayDateInUSFormat>
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          <ShowCurrencySymbol>false</ShowCurrencySymbol>
          <IsNumeric>true</IsNumeric>
          <IsRatio>false</IsRatio>
          <DisplayZeroAsNone>false</DisplayZeroAsNone>
          <NumericAmount>0.01</NumericAmount>
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          <NonNumericTextHeader />
          <FootnoteIndexer />
          <hasSegments>false</hasSegments>
          <hasScenarios>false</hasScenarios>
          <DisplayDateInUSFormat>false</DisplayDateInUSFormat>
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      <OriginalInstanceReportColumns />
      <ElementDataType>xbrli:decimalItemType</ElementDataType>
      <SimpleDataType>decimal</SimpleDataType>
      <ElementDefenition>Face amount or stated value of contingent convertible preferred stock per share; generally not indicative of the fair market value per share.</ElementDefenition>
      <ElementReferences>No authoritative reference available.</ElementReferences>
      <IsTotalLabel>false</IsTotalLabel>
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    <Row>
      <Id>13</Id>
      <Label>Treasury stock, at cost; par value $0.01 per share</Label>
      <Level>0</Level>
      <ElementName />
      <ElementPrefix>na</ElementPrefix>
      <IsBaseElement>true</IsBaseElement>
      <BalanceType>na</BalanceType>
      <PeriodType>na</PeriodType>
      <ShortDefinition>No definition available.</ShortDefinition>
      <IsReportTitle>false</IsReportTitle>
      <IsSegmentTitle>true</IsSegmentTitle>
      <IsSubReportEnd>false</IsSubReportEnd>
      <IsCalendarTitle>false</IsCalendarTitle>
      <IsTuple>false</IsTuple>
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      <IsBeginningBalance>false</IsBeginningBalance>
      <IsEndingBalance>false</IsEndingBalance>
      <IsReverseSign>false</IsReverseSign>
      <PreferredLabelRole>http://greenhill-co.com/role/statementsofchangesinequityparenthetical</PreferredLabelRole>
      <IsEPS>false</IsEPS>
      <FootnoteIndexer />
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          <ShowCurrencySymbol>false</ShowCurrencySymbol>
          <IsNumeric>false</IsNumeric>
          <IsRatio>false</IsRatio>
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          <NonNumericTextHeader />
          <FootnoteIndexer />
          <hasSegments>false</hasSegments>
          <hasScenarios>false</hasScenarios>
          <DisplayDateInUSFormat>false</DisplayDateInUSFormat>
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          <Id>2</Id>
          <ShowCurrencySymbol>false</ShowCurrencySymbol>
          <IsNumeric>false</IsNumeric>
          <IsRatio>false</IsRatio>
          <DisplayZeroAsNone>false</DisplayZeroAsNone>
          <NumericAmount>0</NumericAmount>
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          <NonNumbericText />
          <NonNumericTextHeader />
          <FootnoteIndexer />
          <hasSegments>false</hasSegments>
          <hasScenarios>false</hasScenarios>
          <DisplayDateInUSFormat>false</DisplayDateInUSFormat>
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      </Cells>
      <OriginalInstanceReportColumns>
        <Columns>
          <LabelColumn>false</LabelColumn>
          <Id>7</Id>
          <Labels>
            <Label Id="1" Label=" Treasury stock, at cost; par value $0.01 per share" />
            <Label Id="2" Label="9/30/2010" />
          </Labels>
          <CurrencyCode>USD</CurrencyCode>
          <FootnoteIndexer />
          <hasSegments>true</hasSegments>
          <hasScenarios>false</hasScenarios>
          <Segments>
            <Segment>
              <IsDefaultForEntity>false</IsDefaultForEntity>
              <Name />
              <IsFromEntityGroup>false</IsFromEntityGroup>
              <ValueName>Treasury stock, at cost; par value $0.01 per share</ValueName>
              <ValueType>us-gaap_StatementEquityComponentsAxis</ValueType>
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          <Scenarios />
          <Units>
            <Unit>
              <UnitID>USD</UnitID>
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              <StandardMeasure>
                <MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema>
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                <MeasureNamespace>iso4217</MeasureNamespace>
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              <Scale>0</Scale>
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          </Units>
          <CurrencySymbol>$</CurrencySymbol>
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        <Columns>
          <LabelColumn>false</LabelColumn>
          <Id>8</Id>
          <Labels>
            <Label Id="1" Label=" Treasury stock, at cost; par value $0.01 per share" />
            <Label Id="2" Label="12/31/2009" />
          </Labels>
          <CurrencyCode>USD</CurrencyCode>
          <FootnoteIndexer />
          <hasSegments>true</hasSegments>
          <hasScenarios>false</hasScenarios>
          <Segments>
            <Segment>
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              <Name />
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              <ValueName>Treasury stock, at cost; par value $0.01 per share</ValueName>
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                <MeasureNamespace>iso4217</MeasureNamespace>
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              <Scale>0</Scale>
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          <CurrencySymbol>$</CurrencySymbol>
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      <ElementDataType />
      <SimpleDataType>na</SimpleDataType>
      <ElementDefenition>No definition available.</ElementDefenition>
      <ElementReferences>No authoritative reference available.</ElementReferences>
      <IsTotalLabel>false</IsTotalLabel>
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    <Row>
      <Id>16</Id>
      <Label>Treasury stock, par value</Label>
      <Level>2</Level>
      <ElementName>ghl_TreasuryStockParOrStatedValuePerShare</ElementName>
      <ElementPrefix>ghl</ElementPrefix>
      <IsBaseElement>false</IsBaseElement>
      <BalanceType>na</BalanceType>
      <PeriodType>instant</PeriodType>
      <ShortDefinition>Treasury Stock Par Or Stated Value Per Share.</ShortDefinition>
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      <PreferredLabelRole>verboselabel</PreferredLabelRole>
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      <FootnoteIndexer />
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          <DisplayDateInUSFormat>false</DisplayDateInUSFormat>
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      <OriginalInstanceReportColumns />
      <ElementDataType>us-types:perShareItemType</ElementDataType>
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      <IsTotalLabel>false</IsTotalLabel>
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  <Footnotes />
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  <NumberOfRows>9</NumberOfRows>
  <HasScenarios>false</HasScenarios>
  <MonetaryRoundingLevel>UnKnown</MonetaryRoundingLevel>
  <SharesRoundingLevel>UnKnown</SharesRoundingLevel>
  <PerShareRoundingLevel>NoRounding</PerShareRoundingLevel>
  <HasPureData>false</HasPureData>
  <SharesShouldBeRounded>true</SharesShouldBeRounded>
</InstanceReport>
