| Standard label: | Treasury Stock, Shares, Acquired |
| Name: | us-gaap:TreasuryStockSharesAcquired |
| Documentation: | Number of shares that have been repurchased during the period and are being held in treasury. |
| Object type: | cm:Concept |
| Data type: | Shares (xbrli:sharesItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:TreasuryStockSharesAcquired |
| Label | Role | Language |
| Treasury Stock, Shares, Acquired | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 210 10 S99 1 (SX 210.5-02(29)) | http://fasb.org/us-gaap/role/ref/legacyRef | 210 |
| FASB Accounting Standards Codification 505 10 S99 1 (SX 210.3-04) | http://fasb.org/us-gaap/role/ref/legacyRef | 505 |
| FASB Accounting Standards Codification 505 10 50 2 | http://fasb.org/us-gaap/role/ref/legacyRef | 505 |
| Part Of Roll Up: |
| us-gaap:StockIssuedDuringPeriodSharesPeriodIncreaseDecrease |