| Standard label: | Business Combination, Assets and Liabilities Arising from Contingencies, Amount Recognized, Other than at Fair Value, Net |
| Name: | us-gaap:BusinessCombinationAssetsAndLiabilitiesArisingFromContingenciesAmountRecognizedOtherThanAtFairValue |
| Documentation: | The net amount, measured at other than acquisition-date fair value, of all the assets acquired and liabilities assumed that arise from contingencies and were recognized by the entity, if the acquisition-date fair value cannot be determined and other criteria (as defined) related to the contingencies have been met. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | As Of (instant) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:BusinessCombinationAssetsAndLiabilitiesArisingFromContingenciesAmountRecognizedOtherThanAtFairValue |
| Label | Role | Language |
| Business Combination, Assets and Liabilities Arising from Contingencies, Amount Recognized, Other than at Fair Value, Net | http://www.xbrl.org/2003/role/label | en-US |
| Business Combination, Assets and Liabilities Arising from Contingencies, Amount Recognized, Other than at Fair Value, Net, Total | http://www.xbrl.org/2003/role/totalLabel | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 450 20 30 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 450 |
| FASB Accounting Standards Codification 805 20 50 1 (d)(1) | http://fasb.org/us-gaap/role/ref/legacyRef | 805 |