| Standard label: | Workers' Compensation Discount, Prior Year Amount |
| Name: | us-gaap:WorkersCompensationDiscountPriorYearAmount |
| Documentation: | Prior year monetary amount of the change in worker's compensation reserve liability resulting from the discount applied to reduce the reserve to present value. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:WorkersCompensationDiscountPriorYearAmount |
| Label | Role | Language |
| Workers' Compensation Discount, Prior Year Amount | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 944 210 S99 1 (SX 210.7-03.(a),13(b)) | http://fasb.org/us-gaap/role/ref/legacyRef | 944 |