| Standard label: | Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Expirations |
| Name: | us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExpirations |
| Documentation: | Number of shares under non-option equity instrument agreements for which rights to exercise lapsed. |
| 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:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExpirations |
| Label | Role | Language |
| Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Expirations | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 718 10 50 2 (c)(1)(iv)(4) | http://fasb.org/us-gaap/role/ref/legacyRef | 718 |
| Part Of Roll Up: |
| us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeituresAndExpirations |