2.4.0.8 Html 142 193 1 false 44 0 false 6 false false R1.htm 0001000 - Document - Document and Entity Information Sheet http://www.greenhill.com/role/DocumentAndEntityInformation Document and Entity Information false false R2.htm 1001000 - Statement - Consolidated Statements of Financial Condition Sheet http://www.greenhill.com/role/ConsolidatedStatementsOfFinancialCondition Consolidated Statements of Financial Condition false false R3.htm 1001501 - Statement - Consolidated Statements of Financial Condition (Parenthetical) Sheet http://www.greenhill.com/role/ConsolidatedStatementsOfFinancialConditionParenthetical Consolidated Statements of Financial Condition (Parenthetical) false false R4.htm 1002000 - Statement - Consolidated Statements of Income Sheet http://www.greenhill.com/role/ConsolidatedStatementsOfIncome Consolidated Statements of Income false false R5.htm 1003000 - Statement - Consolidated Statements of Comprehensive Income Sheet http://www.greenhill.com/role/ConsolidatedStatementsOfComprehensiveIncome Consolidated Statements of Comprehensive Income false false R6.htm 1004000 - Statement - Consolidated Statements of Changes in Equity Sheet http://www.greenhill.com/role/ConsolidatedStatementsOfChangesInEquity Consolidated Statements of Changes in Equity false false R7.htm 1004501 - Statement - Consolidated Statements of Changes in Equity (Parenthetical) Sheet http://www.greenhill.com/role/ConsolidatedStatementsOfChangesInEquityParenthetical Consolidated Statements of Changes in Equity (Parenthetical) false false R8.htm 1005000 - Statement - Consolidated Statements of Cash Flows Sheet http://www.greenhill.com/role/ConsolidatedStatementsOfCashFlows Consolidated Statements of Cash Flows false false R9.htm 2101100 - Disclosure - Organization Sheet http://www.greenhill.com/role/Organization Organization false false R10.htm 2102100 - Disclosure - Summary of Significant Accounting Policies Sheet http://www.greenhill.com/role/SummaryOfSignificantAccountingPolicies Summary of Significant Accounting Policies false false R11.htm 2104100 - Disclosure - Investments Sheet http://www.greenhill.com/role/Investments Investments false false R12.htm 2106100 - Disclosure - Related Parties Sheet http://www.greenhill.com/role/RelatedParties Related Parties false false R13.htm 2108100 - Disclosure - Revolving Bank Loan Facility Sheet http://www.greenhill.com/role/RevolvingBankLoanFacility Revolving Bank Loan Facility false false R14.htm 2109100 - Disclosure - Equity Sheet http://www.greenhill.com/role/Equity Equity false false R15.htm 2110100 - Disclosure - Earnings Per Share Sheet http://www.greenhill.com/role/EarningsPerShare Earnings Per Share false false R16.htm 2114100 - Disclosure - Income Taxes Sheet http://www.greenhill.com/role/IncomeTaxes Income Taxes false false R17.htm 2115100 - Disclosure - Regulatory Requirements Sheet http://www.greenhill.com/role/RegulatoryRequirements Regulatory Requirements false false R18.htm 2116100 - Disclosure - Business Information Sheet http://www.greenhill.com/role/BusinessInformation Business Information false false R19.htm 2117100 - Disclosure - Subsequent Events Sheet http://www.greenhill.com/role/SubsequentEvents Subsequent Events false false R20.htm 2202201 - Disclosure - Summary of Significant Accounting Policies (Policies) Sheet http://www.greenhill.com/role/SummaryOfSignificantAccountingPoliciesPolicies Summary of Significant Accounting Policies (Policies) false false R21.htm 2304301 - Disclosure - Investments (Tables) Sheet http://www.greenhill.com/role/InvestmentsTables Investments (Tables) false false R22.htm 2310301 - Disclosure - Earnings Per Share (Tables) Sheet http://www.greenhill.com/role/EarningsPerShareTables Earnings Per Share (Tables) false false R23.htm 2316301 - Disclosure - Business Information (Tables) Sheet http://www.greenhill.com/role/BusinessInformationTables Business Information (Tables) false false R24.htm 2401401 - Disclosure - Organization- Business Information (Details) Sheet http://www.greenhill.com/role/OrganizationBusinessInformationDetails Organization- Business Information (Details) false false R25.htm 2402402 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail) Sheet http://www.greenhill.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail Summary of Significant Accounting Policies - Additional Information (Detail) false false R26.htm 2404402 - Disclosure - Investments - Additional Information (Detail) Sheet http://www.greenhill.com/role/InvestmentsAdditionalInformationDetail Investments - Additional Information (Detail) false false R27.htm 2404403 - Disclosure - Investments - Carrying Value of Investments in Merchant Banking Funds (Details) Sheet http://www.greenhill.com/role/InvestmentsCarryingValueOfInvestmentsInMerchantBankingFundsDetails Investments - Carrying Value of Investments in Merchant Banking Funds (Details) false false R28.htm 2404404 - Disclosure - Investments - Other Investments (Details) Sheet http://www.greenhill.com/role/InvestmentsOtherInvestmentsDetails Investments - Other Investments (Details) false false R29.htm 2404405 - Disclosure - Investments - Investment Revenues (Details) Sheet http://www.greenhill.com/role/InvestmentsInvestmentRevenuesDetails Investments - Investment Revenues (Details) false false R30.htm 2404406 - Disclosure - Investments - Assets Measured at Fair Value on Recurring Basis (Details) Sheet http://www.greenhill.com/role/InvestmentsAssetsMeasuredAtFairValueOnRecurringBasisDetails Investments - Assets Measured at Fair Value on Recurring Basis (Details) false false R31.htm 2406401 - Disclosure - Related Parties - Additional Information (Detail) Sheet http://www.greenhill.com/role/RelatedPartiesAdditionalInformationDetail Related Parties - Additional Information (Detail) false false R32.htm 2408401 - Disclosure - Revolving Bank Loan Facility - Additional Information (Detail) Sheet http://www.greenhill.com/role/RevolvingBankLoanFacilityAdditionalInformationDetail Revolving Bank Loan Facility - Additional Information (Detail) false false R33.htm 2409401 - Disclosure - Equity - Additional Information (Detail) Sheet http://www.greenhill.com/role/EquityAdditionalInformationDetail Equity - Additional Information (Detail) false false R34.htm 2410402 - Disclosure - Earnings Per Share - Additional Information (Details) Sheet http://www.greenhill.com/role/EarningsPerShareAdditionalInformationDetails Earnings Per Share - Additional Information (Details) false false R35.htm 2410403 - Disclosure - Earnings Per Share Earnings Per Share - Reconciliation (Details) Sheet http://www.greenhill.com/role/EarningsPerShareEarningsPerShareReconciliationDetails Earnings Per Share Earnings Per Share - Reconciliation (Details) false false R36.htm 2415401 - Disclosure - Regulatory Requirements - Additional Information (Detail) Sheet http://www.greenhill.com/role/RegulatoryRequirementsAdditionalInformationDetail Regulatory Requirements - Additional Information (Detail) false false R37.htm 2416402 - Disclosure - Business Information - Additional Information (Detail) Sheet http://www.greenhill.com/role/BusinessInformationAdditionalInformationDetail Business Information - Additional Information (Detail) false false R38.htm 2417401 - Disclosure - Subsequent Events - Additional Information (Detail) Sheet http://www.greenhill.com/role/SubsequentEventsAdditionalInformationDetail Subsequent Events - Additional Information (Detail) true false All Reports Book All Reports Element us-gaap_EmployeeRelatedLiabilitiesCurrentAndNoncurrent had a mix of decimals attribute values: -5 -3. Element us-gaap_SharePrice had a mix of decimals attribute values: 0 2. 'Monetary' elements on report '2402402 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail)' had a mix of different decimal attribute values. 'Monetary' elements on report '2404402 - Disclosure - Investments - Additional Information (Detail)' had a mix of different decimal attribute values. 'Monetary' elements on report '2406401 - Disclosure - Related Parties - Additional Information (Detail)' had a mix of different decimal attribute values. Process Flow-Through: 1001000 - Statement - Consolidated Statements of Financial Condition Process Flow-Through: Removing column 'Sep. 30, 2012' Process Flow-Through: Removing column 'Dec. 31, 2011' Process Flow-Through: 1001501 - Statement - Consolidated Statements of Financial Condition (Parenthetical) Process Flow-Through: 1002000 - Statement - Consolidated Statements of Income Process Flow-Through: 1003000 - Statement - Consolidated Statements of Comprehensive Income Process Flow-Through: 1004501 - Statement - Consolidated Statements of Changes in Equity (Parenthetical) Process Flow-Through: 1005000 - Statement - Consolidated Statements of Cash Flows ghl-20130930.xml ghl-20130930.xsd ghl-20130930_cal.xml ghl-20130930_def.xml ghl-20130930_lab.xml ghl-20130930_pre.xml true true