| Standard label: | Cost-method Investments [Member] |
| Name: | us-gaap:CostmethodInvestmentsMember |
| Documentation: | Investment in the stock of an investee recognized as cost-method. |
| 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:CostmethodInvestmentsMember |
| Label | Role | Language |
| Cost-method Investments [Member] | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 325 20 35 1A | http://fasb.org/us-gaap/role/ref/legacyRef | 325 |
| FASB Accounting Standards Codification 325 20 30 1 | http://fasb.org/us-gaap/role/ref/legacyRef | 325 |
| FASB Accounting Standards Codification 325 20 05 2 | http://fasb.org/us-gaap/role/ref/legacyRef | 325 |
| FASB Accounting Standards Codification 325 20 25 2 | http://fasb.org/us-gaap/role/ref/legacyRef | 325 |
| FASB Accounting Standards Codification 325 20 35 2 | http://fasb.org/us-gaap/role/ref/legacyRef | 325 |
| FASB Accounting Standards Codification 325 20 05 3 | http://fasb.org/us-gaap/role/ref/legacyRef | 325 |