| Standard label: | Former Gain Contingency, Recognized in Current Period |
| Name: | us-gaap:FormerGainContingencyRecognizedInCurrentPeriod |
| Documentation: | Amount of gain recognized in the period that had been disclosed in prior periods as a contingent gain. |
| 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:FormerGainContingencyRecognizedInCurrentPeriod |
| Label | Role | Language |
| Former Gain Contingency, Recognized in Current Period | 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 |