| Standard label: | Payments to Acquire and Develop Real Estate | 
| Name: | us-gaap:PaymentsToAcquireAndDevelopRealEstate | 
| Documentation: | The cash outflow from the acquisition of a piece of land and anything permanently fixed to it, including buildings, structures on it and so forth, and payments to develop real estate assets by adding improvements on or to a parcel of land. Such improvements may include drainage, utilities, subdividing, access, buildings, and any combination of these elements. Including real estate intended to generate income for the owner; excluding real estate acquired for use by the owner. | 
| 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:PaymentsToAcquireAndDevelopRealEstate | 
| Label | Role | Language | 
| Payments to Acquire and Develop Real Estate | http://www.xbrl.org/2003/role/label | en-US | 
| Payments to Acquire and Develop Real Estate, Total | http://www.xbrl.org/2003/role/totalLabel | en-US | 
| Reference | Role | Topic | 
| FASB Accounting Standards Codification 230 10 45 13 (c) | http://fasb.org/us-gaap/role/ref/legacyRef | 230 | 
| Part Of Roll Up: | 
| us-gaap:PaymentsToAcquirePropertyPlantAndEquipment |