| Standard label: | Multiemployer Plans, Plan Assets |
| Name: | us-gaap:MultiemployerPlansPlanAssets |
| Documentation: | Amount of plan assets attributable to the pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. |
| 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:MultiemployerPlansPlanAssets |
| Label | Role | Language |
| Multiemployer Plans, Plan Assets | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 715 80 50 7 (c) | http://fasb.org/us-gaap/role/ref/legacyRef | 715 |