 | us-gaap:InvestmentIncomeInterestAndDividendAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeAlternative |
 | us-gaap:InvestmentIncomeInterestAndDividendAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeAlternativeStatementTable |
 | us-gaap:InvestmentIncomeInterestAndDividendAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateExcludingREITs |
 | us-gaap:InvestmentIncomeInterestAndDividendAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateExcludingREITsStatementTable |
 | us-gaap:InvestmentIncomeInterestAndDividendAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateInvestmentTrusts |
 | us-gaap:InvestmentIncomeInterestAndDividendAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateInvestmentTrustsStatementTable |
 | us-gaap:InvestmentIncomeInterestAndDividendAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncome |
 | us-gaap:InvestmentIncomeInterestAndDividend | summation-item | http://fasb.org/us-gaap/role/statement/StatementOfIncome |
 | us-gaap:InterestRevenueExpenseNet | summation-item | http://fasb.org/us-gaap/role/statement/StatementOfIncomeDiscontinuedOperationsAlternate |
 | us-gaap:InvestmentIncomeInterestAndDividendAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeStatementTable |
 | us-gaap:InvestmentIncomeInterestAndDividendAbstract | parent-child | http://fasb.org/us-gaap/role/disclosure/InvestmentsDebtAndEquitySecurities |
 | us-gaap:InvestmentIncomeInterestAndDividendAbstract | domain-member | http://fasb.org/us-gaap/role/disclosure/InvestmentsDebtAndEquitySecuritiesScheduleOfInvestmentIncomeReportedAmountsByCategoryTable |
 | us-gaap:InterestRevenueOrExpenseNetAbstract | parent-child | http://fasb.org/us-gaap/role/disclosure/SegmentReporting |
 | us-gaap:InterestRevenueOrExpenseNetAbstract | domain-member | http://fasb.org/us-gaap/role/disclosure/SegmentReportingScheduleOfSegmentReportingInformationBySegmentTable |