 | us-gaap:InvestmentsBySecondaryCategorizationDomain | parent-child | http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings |
 | us-gaap:InvestmentsBySecondaryCategorizationDomain | dimension-default | http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings |
 | us-gaap:InvestmentsBySecondaryCategorizationDomain | dimension-domain | http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings |
 | us-gaap:InvestmentsBySecondaryCategorizationDomain | parent-child | http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased |
 | us-gaap:InvestmentsBySecondaryCategorizationDomain | dimension-default | http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable |
 | us-gaap:InvestmentsBySecondaryCategorizationDomain | dimension-domain | http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable |
 | us-gaap:InvestmentsBySecondaryCategorizationDomain | parent-child | http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings |
 | us-gaap:InvestmentsBySecondaryCategorizationDomain | dimension-default | http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings |
 | us-gaap:InvestmentsBySecondaryCategorizationDomain | dimension-domain | http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings |
 | us-gaap:InvestmentsBySecondaryCategorizationDomain | parent-child | http://fasb.org/us-gaap/role/disclosure/OpenOptionContractsWritten |
 | us-gaap:InvestmentsBySecondaryCategorizationDomain | dimension-default | http://fasb.org/us-gaap/role/disclosure/OpenOptionContractsWritten |
 | us-gaap:InvestmentsBySecondaryCategorizationDomain | dimension-domain | http://fasb.org/us-gaap/role/disclosure/OpenOptionContractsWritten |
 | us-gaap:InvestmentsBySecondaryCategorizationDomain | parent-child | http://fasb.org/us-gaap/role/disclosure/OtherThanSecuritiesInvestmentHoldings |
 | us-gaap:InvestmentsBySecondaryCategorizationDomain | dimension-default | http://fasb.org/us-gaap/role/disclosure/OtherThanSecuritiesInvestmentHoldingsInvestmentHoldingsOtherThanSecuritiesTable |
 | us-gaap:InvestmentsBySecondaryCategorizationDomain | dimension-domain | http://fasb.org/us-gaap/role/disclosure/OtherThanSecuritiesInvestmentHoldingsInvestmentHoldingsOtherThanSecuritiesTable |
 | us-gaap:InvestmentsBySecondaryCategorizationDomain | parent-child | http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompany |
 | us-gaap:InvestmentsBySecondaryCategorizationDomain | dimension-default | http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable |
 | us-gaap:InvestmentsBySecondaryCategorizationDomain | dimension-domain | http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable |