| Fact Group (Combination of Network and Hypercube) | |
| Network: | 306000 - Disclosure - Note E. Maturities of Long-term Debt (http://www.abc.com/role/MaturitiesOfLongTermDebt) |
| Hypercube: | Maturities of Long-term Debt [Table] (abc:MaturitiesOfLongTermDebtTable) |
| 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 |
| brm:Units | iso4217:USD |
| brm:CalendarTimeMeasure | ||
| brm:ConceptMeasure | 2009-12-31 | 2010-12-31 |
| Maturities of Long-term Debt [Line Items] | ||
| Maturities of Long-term Debt [Roll Up] | ||
| Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | 22,000,000 | |
| Long-term Debt, Maturities, Repayments of Principal in Year Two | 1,000,000 | |
| Long-term Debt, Maturities, Repayments of Principal in Year Three | 1,000,000 | |
| Long-term Debt, Maturities, Repayments of Principal in Year Four | 1,000,000 | |
| Long-term Debt, Maturities, Repayments of Principal in Year Five | 1,000,000 | |
| Long-term Debt, Maturities, Repayments of Principal after Year Five | 15,000,000 | |
| Long-term Debt, Total | 41,000,000 | 41,000,000 |