| Standard label: | Preferred Units by Name [Axis] |
| Name: | us-gaap:PreferredUnitsByNameAxis |
| Documentation: | Information by type or class of preferred units or special units. |
| 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:PreferredUnitsByNameAxis |
| Label | Role | Language |
| Preferred Units by Name [Axis] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 272 10 50 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 272 |
| FASB Accounting Standards Codification 505 10 S99 5 (SAB TOPIC 4.F) | http://fasb.org/us-gaap/role/ref/legacyRef | 505 |
| FASB Accounting Standards Codification 946 210 S99 1 (SX 210.6-04(16)) | http://fasb.org/us-gaap/role/ref/legacyRef | 946 |