| Standard label: | Gain (Loss) on Disposition of Stock in Subsidiary |
| Name: | us-gaap:GainOrLossOnSaleOfStockInSubsidiary |
| Documentation: | Amount of gain (loss) on sale or disposal of equity in securities of subsidiaries. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:GainOrLossOnSaleOfStockInSubsidiary |
| Label | Role | Language |
| Gain (Loss) on Disposition of Stock in Subsidiary | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 220 10 S99 2 (SX 210.5-03(b)(7)(c)) | http://www.xbrl.org/2009/role/commonPracticeRef | 220 |
| FASB Accounting Standards Codification 220 10 S99 2 (SX 210.5-03(b)(9)(a)) | http://www.xbrl.org/2009/role/commonPracticeRef | 220 |
| FASB Accounting Standards Codification 230 10 45 28 (b) | http://www.xbrl.org/2009/role/commonPracticeRef | 230 |
| FASB Accounting Standards Codification 942 220 S99 1 (SX 210.9-04(13)(g)) | http://www.xbrl.org/2009/role/commonPracticeRef | 942 |
| FASB Accounting Standards Codification 944 220 S99 1 (SX 210.7-04(3)(a)) | http://www.xbrl.org/2009/role/commonPracticeRef | 944 |
| Part Of Roll Up: |
| us-gaap:GainLossOnSaleOfStockInSubsidiaryOrEquityMethodInvestee |