| Standard label: | Fixed-price Contract [Member] |
| Name: | us-gaap:FixedPriceContractMember |
| Documentation: | Contract with customer in which amount of consideration is fixed. |
| 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:FixedPriceContractMember |
| Label | Role | Language |
| Fixed-price Contract [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 606 10 55 91 (d) | http://www.xbrl.org/2003/role/exampleRef | 606 |