| Standard label: | Treasury Stock, Shares |
| Name: | us-gaap:TreasuryStockShares |
| Documentation: | Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. |
| 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:TreasuryStockShares |
| Label | Role | Language |
| Treasury Stock, Shares | http://www.xbrl.org/2003/role/label | en-US |
| Treasury Stock, Shares, Ending Balance | http://www.xbrl.org/2003/role/periodEndLabel | en-US |
| Treasury Stock, Shares, Beginning Balance | http://www.xbrl.org/2003/role/periodStartLabel | en-US |
| Treasury Stock, Shares, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 210 10 S99 1 (SX 210.5-02.29,30) | http://fasb.org/us-gaap/role/ref/legacyRef | 210 |
| FASB Accounting Standards Codification 505 30 45 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 505 |