2.3.0.11 Html 26 131 1 true 7 0 false 4 true false R1.htm 101 - Document - Document and Entity Information Sheet http://www.gaincapital.com/taxonomy/role/DocumentDocumentandEntityInformation Document and Entity Information false false R2.htm 103 - Statement - Condensed Consolidated Balance Sheet Sheet http://www.gaincapital.com/taxonomy/role/StatementOfFinancialPositionUnclassified-SecuritiesBasedOperations Condensed Consolidated Balance Sheet false false R3.htm 104 - Statement - Condensed Consolidated Balance Sheet (Parenthetical) Sheet http://www.gaincapital.com/taxonomy/role/StatementOfFinancialPositionUnclassified-SecuritiesBasedOperationsParenthetical Condensed Consolidated Balance Sheet (Parenthetical) false false R4.htm 105 - Statement - Condensed Consolidated Statements Of Operations And Comprehensive Income Sheet http://www.gaincapital.com/taxonomy/role/StatementOfIncomeSecuritiesBasedIncome Condensed Consolidated Statements Of Operations And Comprehensive Income false false R5.htm 106 - Statement - Condensed Consolidated Statements Of Operations And Comprehensive Income (Parenthetical) Sheet http://www.gaincapital.com/taxonomy/role/StatementOfIncomeSecuritiesBasedIncomeParenthetical Condensed Consolidated Statements Of Operations And Comprehensive Income (Parenthetical) false false R6.htm 107 - Statement - Condensed Consolidated Statement of Changes in Equity Sheet http://www.gaincapital.com/taxonomy/role/StatementOfShareholdersEquityAndOtherComprehensiveIncome Condensed Consolidated Statement of Changes in Equity false false R7.htm 108 - Statement - Condensed Consolidated Statements of Cash Flows Sheet http://www.gaincapital.com/taxonomy/role/StatementOfCashFlowsIndirectSecuritiesBasedOperations Condensed Consolidated Statements of Cash Flows false false R8.htm 109 - Disclosure - DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION Sheet http://www.gaincapital.com/taxonomy/role/NotesToFinancialStatementsBusinessDescriptionAndBasisOfPresentationTextBlock DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION false false R9.htm 110 - Disclosure - RECENT ACCOUNTING PRONOUNCEMENTS Sheet http://www.gaincapital.com/taxonomy/role/NotesToFinancialStatementsNewAccountingPronouncementsAndChangesInAccountingPrinciplesDisclosureTextBlock RECENT ACCOUNTING PRONOUNCEMENTS false false R10.htm 111 - Disclosure - ADDITIONAL FINANCIAL INFORMATION: Sheet http://www.gaincapital.com/taxonomy/role/NotesToFinancialStatementsAdditionalFinancialInformationDisclosureTextBlock ADDITIONAL FINANCIAL INFORMATION: false false R11.htm 112 - Disclosure - RELATED PARTY TRANSACTIONS Sheet http://www.gaincapital.com/taxonomy/role/NotesToFinancialStatementsRelatedPartyTransactionsDisclosureTextBlock RELATED PARTY TRANSACTIONS false false R12.htm 113 - Disclosure - TERM LOAN AND REVOLVER Sheet http://www.gaincapital.com/taxonomy/role/NotesToFinancialStatementsDebtDisclosureTextBlock TERM LOAN AND REVOLVER false false R13.htm 114 - Disclosure - EQUITY Sheet http://www.gaincapital.com/taxonomy/role/NotesToFinancialStatementsStockholdersEquityNoteDisclosureTextBlock EQUITY false false R14.htm 115 - Disclosure - SHARE BASED COMPENSATION Sheet http://www.gaincapital.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock SHARE BASED COMPENSATION false false R15.htm 116 - Disclosure - LEGAL Sheet http://www.gaincapital.com/taxonomy/role/NotesToFinancialStatementsLegalMattersAndContingenciesTextBlock LEGAL false false R16.htm 117 - Disclosure - INCOME TAXES Sheet http://www.gaincapital.com/taxonomy/role/NotesToFinancialStatementsIncomeTaxDisclosureTextBlock INCOME TAXES false false R17.htm 118 - Disclosure - REGULATORY REQUIREMENTS Sheet http://www.gaincapital.com/taxonomy/role/NotesToFinancialStatementsRegulatoryRequirementsDisclosureTextBlock REGULATORY REQUIREMENTS false false R18.htm 119 - Disclosure - SEGMENT INFORMATION Sheet http://www.gaincapital.com/taxonomy/role/NotesToFinancialStatementsSegmentReportingDisclosureTextBlock SEGMENT INFORMATION false false R19.htm 120 - Disclosure - SUBSEQUENT EVENTS Sheet http://www.gaincapital.com/taxonomy/role/NotesToFinancialStatementsSubsequentEventsTextBlock SUBSEQUENT EVENTS false false All Reports Book All Reports 'Shares' elements on report '104 - Statement - Condensed Consolidated Balance Sheet (Parenthetical)' had a mix of different decimal attribute values. Process Flow-Through: 103 - Statement - Condensed Consolidated Balance Sheet Process Flow-Through: Removing column 'Jun. 30, 2010' Process Flow-Through: Removing column 'Dec. 31, 2009' Process Flow-Through: 104 - Statement - Condensed Consolidated Balance Sheet (Parenthetical) Process Flow-Through: 105 - Statement - Condensed Consolidated Statements Of Operations And Comprehensive Income Process Flow-Through: 106 - Statement - Condensed Consolidated Statements Of Operations And Comprehensive Income (Parenthetical) Process Flow-Through: 108 - Statement - Condensed Consolidated Statements of Cash Flows gcap-20110630.xml gcap-20110630.xsd gcap-20110630_cal.xml gcap-20110630_def.xml gcap-20110630_lab.xml gcap-20110630_pre.xml true true