| Standard label: | Common Stock, Shares Held in Employee Trust, Shares |
| Name: | us-gaap:CommonStockSharesHeldInEmployeeTrustShares |
| Documentation: | Number of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned. |
| Object type: | cm:Concept |
| Data type: | Shares (xbrli:sharesItemType) |
| Period type: | As Of (instant) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:CommonStockSharesHeldInEmployeeTrustShares |
| Label | Role | Language |
| Common Stock, Shares Held in Employee Trust, Shares | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 718 40 25 12 | http://fasb.org/us-gaap/role/ref/legacyRef | 718 |