| Standard label: | Depreciation, Depletion and Amortization |
| Name: | us-gaap:DepreciationDepletionAndAmortization |
| Documentation: | The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. |
| 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:DepreciationDepletionAndAmortization |
| Label | Role | Language |
| Depreciation, Depletion and Amortization | http://www.xbrl.org/2003/role/label | en-US |
| Depreciation, Depletion and Amortization, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 230 10 45 28 (b) | http://fasb.org/us-gaap/role/ref/legacyRef | 230 |
| FASB Accounting Standards Codification 280 10 50 22 (e) | http://www.xbrl.org/2003/role/disclosureRef | 280 |
| Part Of Roll Up: |
| us-gaap:AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities |