 | us-gaap:DJIAIndexFutureMember | domain-member | http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists |
 | us-gaap:NASDAQIndexFutureMember | domain-member | http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists |
 | us-gaap:EurodollarFutureMember | domain-member | http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists |
 | us-gaap:EuriborFutureMember | domain-member | http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists |
 | us-gaap:BondFutureMember | domain-member | http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists |
 | us-gaap:SingleStockFutureMember | domain-member | http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists |
 | us-gaap:ForeignExchangeFutureMember | domain-member | http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists |
 | us-gaap:DJIAIndexFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftDistributionOfAssetsLiabilitiesAndStockholdersEquityTable |
 | us-gaap:NASDAQIndexFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftDistributionOfAssetsLiabilitiesAndStockholdersEquityTable |
 | us-gaap:EurodollarFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftDistributionOfAssetsLiabilitiesAndStockholdersEquityTable |
 | us-gaap:EuriborFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftDistributionOfAssetsLiabilitiesAndStockholdersEquityTable |
 | us-gaap:BondFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftDistributionOfAssetsLiabilitiesAndStockholdersEquityTable |
 | us-gaap:SingleStockFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftDistributionOfAssetsLiabilitiesAndStockholdersEquityTable |
 | us-gaap:ForeignExchangeFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftDistributionOfAssetsLiabilitiesAndStockholdersEquityTable |
 | us-gaap:DJIAIndexFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftFinancingReceivableBeforeAllowanceForCreditLossMaturityTable |
 | us-gaap:NASDAQIndexFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftFinancingReceivableBeforeAllowanceForCreditLossMaturityTable |
 | us-gaap:EurodollarFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftFinancingReceivableBeforeAllowanceForCreditLossMaturityTable |
 | us-gaap:EuriborFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftFinancingReceivableBeforeAllowanceForCreditLossMaturityTable |
 | us-gaap:BondFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftFinancingReceivableBeforeAllowanceForCreditLossMaturityTable |
 | us-gaap:SingleStockFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftFinancingReceivableBeforeAllowanceForCreditLossMaturityTable |
 | us-gaap:ForeignExchangeFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftFinancingReceivableBeforeAllowanceForCreditLossMaturityTable |
 | us-gaap:DJIAIndexFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftInterestRateAndInterestDifferentialAnalysisTable |
 | us-gaap:NASDAQIndexFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftInterestRateAndInterestDifferentialAnalysisTable |
 | us-gaap:EurodollarFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftInterestRateAndInterestDifferentialAnalysisTable |
 | us-gaap:EuriborFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftInterestRateAndInterestDifferentialAnalysisTable |
 | us-gaap:BondFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftInterestRateAndInterestDifferentialAnalysisTable |
 | us-gaap:SingleStockFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftInterestRateAndInterestDifferentialAnalysisTable |
 | us-gaap:ForeignExchangeFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftInterestRateAndInterestDifferentialAnalysisTable |
 | us-gaap:DJIAIndexFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftTransferOfCertainFinancialAssetsAccountedForAsSecuredBorrowingsTable |
 | us-gaap:NASDAQIndexFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftTransferOfCertainFinancialAssetsAccountedForAsSecuredBorrowingsTable |
 | us-gaap:EurodollarFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftTransferOfCertainFinancialAssetsAccountedForAsSecuredBorrowingsTable |
 | us-gaap:EuriborFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftTransferOfCertainFinancialAssetsAccountedForAsSecuredBorrowingsTable |
 | us-gaap:BondFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftTransferOfCertainFinancialAssetsAccountedForAsSecuredBorrowingsTable |
 | us-gaap:SingleStockFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftTransferOfCertainFinancialAssetsAccountedForAsSecuredBorrowingsTable |
 | us-gaap:ForeignExchangeFutureMember | domain-member | http://fasb.org/us-gaap/role/disclosure/FinancialServicesBankingAndThriftTransferOfCertainFinancialAssetsAccountedForAsSecuredBorrowingsTable |