| Standard label: | Multiemployer Plan Name [Domain] |
| Name: | us-gaap:MultiemployerPlanNameDomain |
| Documentation: | Legal names of pension or postretirement benefit plans to which two or more unrelated employers contribute to the same plan where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. |
| Object type: | cm:Member |
| Data type: | [Member] (nonnum:domainItemType) |
| Period type: | For Period (duration) |
| Balance type: | (no balance type) |
| Abstract: | true |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:MultiemployerPlanNameDomain |
| Label | Role | Language |
| Multiemployer Plan Name [Domain] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 715 80 50 5 (a) | http://fasb.org/us-gaap/role/ref/legacyRef | 715 |