| Standard label: | Undistributed Earnings (Loss) Allocated to Participating Securities, Basic |
| Name: | us-gaap:UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic |
| Documentation: | Amount of undistributed earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic |
| Label | Role | Language |
| Undistributed Earnings (Loss) Allocated to Participating Securities, Basic | http://www.xbrl.org/2003/role/label | en-US |
| Undistributed Earnings (Loss) Allocated to Participating Securities, Basic, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 260 10 45 60B (b) | http://fasb.org/us-gaap/role/ref/legacyRef | 260 |
| Part Of Roll Up: |
| us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic |