| Fact Group (Combination of Network and Hypercube) | |
| Network: | 154102 - Statement - Statement of Changes in Equity, Common Stock (http://www.abc.com/role/StatementOfChangesInEquityCommonStock) |
| Hypercube: | Changes in Common Stock, by Class [Table] (abc:ChangesInCommonStockByClassTable) |
| Slicers (applies to each fact value in each table cell) | |
| brm:ReportingEntityMeasure | 0000000001 (http://www.sec.gov/CIK) |
| us-gaap:CreationDateAxis | abc:AsReportedFebruary122011Member |
| dei:LegalEntityAxis | dei:EntityDomain |
| abc:ClassOfCommonStockAxis | |||
| brm:ConceptMeasure | Class of Common Stock, All Classes [Domain] | Common Class A [Member] | Common Class B [Member] |
| Changes in Common Stock, by Class [Line Items] | |||
| Common Stock, Value [Roll Forward] | |||
| Common Stock, Value, Outstanding, Beginning Balance | 10,000,000 | 10,000,000 | |
| Common Stock, Value, Outstanding, Period Increase (Decrease) | 0 | ||
| Common Stock, Value, Outstanding, Ending Balance | 10,000,000 | 10,000,000 | |
| Common Stock, Shares Outstanding [Roll Forward] | |||
| Common Stock, Shares, Outstanding, Beginning Balance | 90,000 | 50,000 | 40,000 |
| Common Stock, Shares Outstanding, Period Increase (Decrease) | 0 | 0 | 0 |
| Common Stock, Shares, Outstanding, Ending Balance | 90,000 | 50,000 | 40,000 |