| Standard label: | Pushdown Accounting [Policy Text Block] |
| Name: | us-gaap:PushdownAccountingPolicyTextBlock |
| Documentation: | Disclosure of accounting policy by the acquiree for election of option to apply pushdown accounting when a change-in-control event has occurred. |
| Object type: | cm:Level2TextBlock |
| Data type: | Text Block (HTML) (nonnum:textBlockItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:PushdownAccountingPolicyTextBlock |
| Label | Role | Language |
| Pushdown Accounting [Policy Text Block] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 805 50 50 5 | http://fasb.org/us-gaap/role/ref/legacyRef | 805 |
| FASB Accounting Standards Codification 805 50 50 6 | http://fasb.org/us-gaap/role/ref/legacyRef | 805 |