 | us-gaap:InvestmentIncomeNetAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeAlternative |
 | us-gaap:InvestmentIncomeNetAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeAlternativeStatementTable |
 | us-gaap:InvestmentIncomeNetAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateExcludingREITs |
 | us-gaap:InvestmentIncomeNetAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateExcludingREITsStatementTable |
 | us-gaap:InvestmentIncomeNetAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateInvestmentTrusts |
 | us-gaap:InvestmentIncomeNetAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateInvestmentTrustsStatementTable |
 | us-gaap:InvestmentIncomeNetAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncome |
 | us-gaap:InvestmentIncomeNonoperating | summation-item | http://fasb.org/us-gaap/role/statement/StatementOfIncome |
 | us-gaap:InvestmentIncomeNetAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeStatementTable |
 | us-gaap:InvestmentIncomeNetAbstract | parent-child | http://fasb.org/us-gaap/role/disclosure/InvestmentsDebtAndEquitySecurities |
 | us-gaap:InvestmentIncomeNetAbstract | domain-member | http://fasb.org/us-gaap/role/disclosure/InvestmentsDebtAndEquitySecuritiesScheduleOfInvestmentIncomeReportedAmountsByCategoryTable |
 | us-gaap:ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems | parent-child | http://fasb.org/us-gaap/role/disclosure/Equity |
 | us-gaap:ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems | domain-member | http://fasb.org/us-gaap/role/disclosure/EquityReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable |
 | us-gaap:ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeOnDerivativesLineItems | parent-child | http://fasb.org/us-gaap/role/disclosure/DerivativeInstrumentsAndHedgingActivities |
 | us-gaap:ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeOnDerivativesLineItems | domain-member | http://fasb.org/us-gaap/role/disclosure/DerivativeInstrumentsAndHedgingActivitiesReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable |
 | us-gaap:InvestmentCompanyNetAssetsFromOperationsIncreaseDecreaseAbstract | parent-child | http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompany |
 | us-gaap:InvestmentCompanyNetAssetsFromOperationsIncreaseDecrease | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompany |