| Standard label: | Extinguishment of Debt [Axis] |
| Name: | us-gaap:ExtinguishmentOfDebtAxis |
| Documentation: | Information pertaining to the debt extinguished including the amount of gain (loss), the income tax effect on the gain (loss), and the amount of gain (loss), net or the related income tax, by debt instrument. |
| Object type: | cm:Axis |
| Data type: | Text/String (xbrli:stringItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:ExtinguishmentOfDebtAxis |
| Label | Role | Language |
| Extinguishment of Debt [Axis] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 470 50 50 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 470 |