| Standard label: | Land Purchase Options, Description |
| Name: | us-gaap:LandPurchaseOptionsDescription |
| Documentation: | Describes contracts, agreements and arrangements that give the entity unilateral rights to purchase the land covered by the option for a specified period of time. |
| Object type: | cm:Concept |
| Data type: | Text/String (xbrli:stringItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:LandPurchaseOptionsDescription |
| Label | Role | Language |
| Land Purchase Options, Description | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 970 340 25 3 | http://fasb.org/us-gaap/role/ref/legacyRef | 970 |