| Standard label: | Investments in Majority-owned Subsidiaries [Member] |
| Name: | us-gaap:InvestmentsInMajorityOwnedSubsidiariesMember |
| Documentation: | A category that identifies investments in majority owned subsidiaries. This member would be expected to be further segregated into consolidated subsidiaries. |
| 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:InvestmentsInMajorityOwnedSubsidiariesMember |
| Label | Role | Language |
| Investments in Majority-owned Subsidiaries [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 946 320 S99 6 (SX 210.12-14(1)(a)(1)) | http://fasb.org/us-gaap/role/ref/legacyRef | 946 |