| Standard label: | Distribution of Marketable Securities to Stockholders as Dividends [Member] |
| Name: | us-gaap:DistributionOfMarketableSecuritiesToStockholdersAsDividendsMember |
| Documentation: | The distribution of nonmonetary assets such as marketable securities to stockholders as dividends. |
| Object type: | cm:Member |
| Data type: | [Member] (nonnum:domainItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:DistributionOfMarketableSecuritiesToStockholdersAsDividendsMember |
| Label | Role | Language |
| Distribution of Marketable Securities to Stockholders as Dividends [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 845 10 05 4 (a) | http://fasb.org/us-gaap/role/ref/legacyRef | 845 |