| Standard label: | Amortization of Advance Royalty |
| Name: | us-gaap:AmortizationOfAdvanceRoyalty |
| Documentation: | The expense charged against earnings for the periodic recognition of the advance royalties. These royalties are paid in one accounting period, but are deducted from earnings over time through amortization. For example, royalties that are required to be paid in advance of production from a mineral, oil, or gas property and amortized over the period of right to produce these items. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Debit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:AmortizationOfAdvanceRoyalty |
| Label | Role | Language |
| Amortization of Advance Royalty | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 220 10 S99 2 (SX 210.5-03.3) | http://fasb.org/us-gaap/role/ref/legacyRef | 220 |
| FASB Accounting Standards Codification 230 10 45 28 (b) | http://fasb.org/us-gaap/role/ref/legacyRef | 230 |
| Part Of Roll Up: |
| us-gaap:AmortizationOfDeferredCharges |
| us-gaap:AdjustmentForAmortization |