| Disclosure Descriptive Information |
| Label: | Segment Reporting Information, by Segment |
| Name: | SegmentReportingInformationBySegment |
| Parent Topic: | SegmentReporting |
| Documentation: | Disclosure of the profit or loss and total assets for each reportable segment. |
| Commentary: | Seems like the segment [Axis] would be requried, as would the root member. |
| Status: | |
| US GAAP XBRL Taxonomy Text Block: | us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock |
| Human Readable Examples: | List of human readable examples |
| Machine Readable Examples: | List of machine readable examples |
| Business rules (machine readable): | XBRL Definition Relations |
| US GAAP XBRL Taxonomy Network: | http://fasb.org/us-gaap/role/disclosure/SegmentReporting | XML | HTML |
| References to Accounting Standards Codification (ASC) |
| Item | Description | Reference |
|---|---|---|
| 1 | FASB: Topic:280 Subtopic:10 Section:50 Paragraph:21 Subparagraph:(b) | http://asc.fasb.org/extlink&oid=6534315&loc=d3e8721-108599 |
| 2 | FASB: Topic:280 Subtopic:10 Section:50 Paragraph:22 | http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599 |
| 3 | FASB: Topic:280 Subtopic:10 Section:50 Paragraph:25 | http://asc.fasb.org/extlink&oid=6534315&loc=d3e8813-108599 |
| 4 | FASB: Topic:280 Subtopic:10 Section:50 Paragraph:30 | http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599 |
| 5 | FASB: Topic:350 Subtopic:20 Section:50 Paragraph:1 | http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 |
| Example Disclosure |
| Prototype of Disclosure |
| Line | Label | Object Class (Data type) | Period Type | Balance | Report Element Name |
|---|---|---|---|---|---|
| 1 | Schedule of Segment Reporting Information, by Segment [Table] | Table | us-gaap:ScheduleOfSegmentReportingInformationBySegmentTable | ||
| 2 | Segments [Axis] | Axis | us-gaap:StatementBusinessSegmentsAxis | ||
| 3 | Segments [Domain] | Member | us-gaap:SegmentDomain | ||
| 4 | Eastern Coal Operations [Member] | Member | anr:EasternCoalOperationsMember | ||
| 5 | Western Coal Operations [Member] | Member | anr:WesternCoalOperationsMember | ||
| 6 | Other Segments [Member] | Member | us-gaap:AllOtherSegmentsMember | ||
| 7 | Segment Information | LineItems | us-gaap:SegmentReportingInformationLineItems | ||
| 8 | EBITDA from continuing operations | Concept (Monetary) | For Period | Credit | anr:EarningsBeforeInterestIncomeTaxesDepreciationAndAmortization |
| 9 | Interest expense | Concept (Monetary) | For Period | Debit | us-gaap:InterestExpense |
| 10 | Interest income | Concept (Monetary) | For Period | Credit | us-gaap:InvestmentIncomeNet |
| 11 | Income tax benefit | Concept (Monetary) | For Period | Debit | us-gaap:IncomeTaxExpenseBenefit |
| 12 | Depreciation, depletion and amortization | Concept (Monetary) | For Period | Debit | us-gaap:DepreciationDepletionAndAmortization |
| 13 | Amortization of acquired intangibles, net | Concept (Monetary) | For Period | Debit | us-gaap:AmortizationOfIntangibleAssets |
| 14 | Net loss | Concept (Monetary) | For Period | Credit | us-gaap:IncomeLossFromContinuingOperations |
| Business Rules Summary |
| From | Arcrole (predicate) | To |
|---|---|---|
| disclosures:SegmentReportingInformationBySegment | rules-arcroles:disclosure-hasConceptArrangementPattern | fro:Hierarchy |
| disclosures:SegmentReportingInformationBySegment | rules-arcroles:disclosure-requiresAxis | us-gaap:StatementBusinessSegmentsAxis |
| disclosures:SegmentReportingInformationBySegment | rules-arcroles:disclosure-requiresMember | us-gaap:SegmentDomain |
| disclosures:SegmentReportingInformationBySegment | rules-arcroles:disclosure-requiresConcept | us-gaap:Revenues |
| disclosures:SegmentReportingInformationBySegment | rules-arcroles:disclosure-equivalentTextblock | us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock |
| disclosures:SegmentReportingInformationBySegment | rules-arcroles:disclosure-requiresConcept | us-gaap:Assets |
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