| Name | IncreaseDecreaseOfRestrictedInvestments |
|---|---|
| Namespace | http://fasb.org/us-gaap/2020-01-31 |
| Prefix | us-gaap |
| Data type | xbrli:monetaryItemType |
| Period type | duration |
| Substitution Group | xbrli:item |
| Balance | credit |
| Nillable | True |
| Abstract | False |
| Text | Lang | Role | Container role |
|---|---|---|---|
| Increase (Decrease) of Restricted Investments | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| The net cash inflow or outflow for the increase (decrease) associated with investments (not to include restricted cash) that are pledged or subject to withdrawal restrictions. | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Name | Relation Type | Role | |
|---|---|---|---|
us-gaap:NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | summation-item | http://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirect | |
us-gaap:NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectInvestmentBasedOperations | |
us-gaap:NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectInvestmentBasedOperationsStatementTable | |
us-gaap:IncreaseDecreaseInRestrictedCashAndInvestmentsForOperatingActivitiesAbstract | parent-child | http://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectSecuritiesBasedOperations | |
us-gaap:IncreaseDecreaseInRestrictedCashAndInvestmentsForOperatingActivitiesAbstract | domain-member | http://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectSecuritiesBasedOperationsStatementTable |