 | us-gaap:NonoperatingGainsLossesAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeAlternative |
 | us-gaap:NonoperatingGainsLossesAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeAlternativeStatementTable |
 | us-gaap:NonoperatingGainsLossesAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateExcludingREITs |
 | us-gaap:NonoperatingGainsLossesAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateExcludingREITsStatementTable |
 | us-gaap:NonoperatingGainsLossesAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateInvestmentTrusts |
 | us-gaap:NonoperatingGainsLossesAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeRealEstateInvestmentTrustsStatementTable |
 | us-gaap:NonoperatingGainsLossesAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncome |
 | us-gaap:NonoperatingGainsLosses | summation-item | http://fasb.org/us-gaap/role/statement/StatementOfIncome |
 | us-gaap:NonoperatingGainsLossesAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeStatementTable |
 | us-gaap:AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities | summation-item | http://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirect |
 | us-gaap:RevenuesAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfIncomeInsuranceBasedRevenue |
 | us-gaap:RevenuesAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfIncomeInsuranceBasedRevenueStatementTable |
 | us-gaap:GainLossOnInvestmentsAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectAdditionalElements |
 | us-gaap:ComponentOfOtherIncomeNonoperatingLineItems | parent-child | http://fasb.org/us-gaap/role/disclosure/OtherExpenses |