| Standard label: | Gain Contingency, Unrecorded Amount |
| Name: | us-gaap:GainContingencyUnrecordedAmount |
| Documentation: | The amount or range of possible amounts of gain that could be realized upon the resolution of a contingency. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:GainContingencyUnrecordedAmount |
| Label | Role | Language |
| Gain Contingency, Unrecorded Amount | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 450 30 50 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 450 |