| Standard label: | Malpractice Loss Contingency, Return of Premiums |
| Name: | us-gaap:MalpracticeLossContingencyReturnOfPremiums |
| Documentation: | Amount received during the period representing a return of premiums previously paid, generally under a retrospectively rated policy. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:MalpracticeLossContingencyReturnOfPremiums |
| Label | Role | Language |
| Malpractice Loss Contingency, Return of Premiums | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 954 720 25 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 954 |
| Part Of Roll Up: |
| us-gaap:MalpracticeLossContingencyClaimsIncurredNet |