| Standard label: | Gain (Loss) on Sale of Properties, before Applicable Income Taxes |
| Name: | us-gaap:GainLossOnSaleOfPropertiesBeforeApplicableIncomeTaxes |
| Documentation: | This element represents the amount of gain (loss) on sale of properties during the reporting period gross of the applicable income taxes realized. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:GainLossOnSaleOfPropertiesBeforeApplicableIncomeTaxes |
| Label | Role | Language |
| Gain (Loss) on Sale of Properties, before Applicable Income Taxes | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 974 10 S99 1 (SX 210.3-15.(a)(1)(ii) | http://fasb.org/us-gaap/role/ref/legacyRef | 974 |
| Part Of Roll Up: |
| us-gaap:GainLossOnSaleOfPropertiesNetOfApplicableIncomeTaxes |