| * |  | Network: 1100 - Document - Entity Information (http://www.abc.com/role/EntityInformation) | 
            
            
               | 1 |  | Entity Information [Abstract] | [Abstract] |  |  |  | abc:EntityInformationAbstract | 
            
            
               | 2 |  | Entity [Text Block] | [Concept] | Text Block (HTML) | For period |  | dei:EntityTextBlock | 
            
            
               | 3 |  | Entities [Table] | [Table] |  |  |  | dei:EntitiesTable | 
            
            
               | 4 |  | Legal Entity [Axis] | [Axis] |  |  |  | dei:LegalEntityAxis | 
            
            
               | 5 |  | Entity [Domain] | [Member] |  |  |  | dei:EntityDomain | 
            
            
            
               | 6 |  | Entity Information [Line Items] | [Abstract] |  |  |  | dei:EntityInformationLineItems | 
            
            
               | 7 |  | Entity Information [Set] | [Abstract] |  |  |  | abc:EntityInformationSet | 
            
            
               | 8 |  | Entity Registrant Name | [Concept] | Text/String | For period |  | dei:EntityRegistrantName | 
            
            
               | 9 |  | Current Fiscal Year End Date | [Concept] | Month/Day | For period |  | dei:CurrentFiscalYearEndDate | 
            
            
               | 10 |  | Entity Tax Identification Number | [Concept] | Nine Digit Item | For period |  | dei:EntityTaxIdentificationNumber | 
            
            
               | 11 |  | Entity Other Identification Type | [Concept] | Text/String | For period |  | dei:EntityOtherIdentificationType | 
            
            
               | 12 |  | Entity Other Identification Value | [Concept] | Text/String | For period |  | dei:EntityOtherIdentificationValue | 
            
            
            
            
            
            
            
               | * |  | Network: 1200 - Document - Document Information (http://www.abc.com/role/DocumentInformation) | 
            
            
               | 13 |  | Document Information [Abstract] | [Abstract] |  |  |  | abc:DocumentInformationAbstract | 
            
            
               | 14 |  | Document Information [Text Block] | [Concept] | Text Block (HTML) | For period |  | dei:DocumentInformationTextBlock | 
            
            
               | 15 |  | Document Information [Table] | [Table] |  |  |  | dei:DocumentInformationTable | 
            
            
               | 16 |  | Legal Entity [Axis] | [Axis] |  |  |  | dei:LegalEntityAxis | 
            
            
               | 17 |  | Entity [Domain] | [Member] |  |  |  | dei:EntityDomain | 
            
            
            
               | 18 |  | Document Information [Line Items] | [Abstract] |  |  |  | dei:DocumentInformationLineItems | 
            
            
               | 19 |  | Document Information [Set] | [Abstract] |  |  |  | abc:DocumentInformationSet | 
            
            
               | 20 |  | Document Creation Date | [Concept] | Date | For period |  | dei:DocumentCreationDate | 
            
            
               | 21 |  | Document Period End Date | [Concept] | Date | For period |  | dei:DocumentPeriodEndDate | 
            
            
               | 22 |  | Document Fiscal Year Focus | [Concept] | Year | For period |  | dei:DocumentFiscalYearFocus | 
            
            
               | 23 |  | Document Fiscal Period Focus | [Concept] | Fiscal Period | For period |  | dei:DocumentFiscalPeriodFocus | 
            
            
            
            
            
            
            
               | * |  | Network: 1300 - Disclosure - Accounting Policies (http://www.abc.com/role/Policy) | 
            
            
               | 24 |  | Policy [Abstract] | [Abstract] |  |  |  | abc:PolicyAbstract | 
            
            
               | 25 |  | Revenue Recognition, Percentage-of-Completion Method [Policy Text Block] | [Concept] | Text Block (HTML) | For period |  | us-gaap:RevenueRecognitionPercentageOfCompletionMethod | 
            
            
            
            
               | * |  | Network: 1400 - Disclosure - Work in Progress Information (Text Block) (http://www.abc.com/role/ScheduleTextBlock) | 
            
            
               | 26 |  | Work In Progress [Abstract] | [Abstract] |  |  |  | abc:WorkInProgressAbstract | 
            
            
               | 27 |  | Schedule of Work In Process [Table Text Block] | [Concept] | Text Block (HTML) | For period |  | wip:ScheduleOfWorkInProcessTableTextBlock | 
            
            
            
            
               | * |  | Network: 1500 - Disclosure - Work in Progress Information (http://www.abc.com/role/WorkInProgress) | 
            
            
               | 28 |  | Work In Progress [Abstract] | [Abstract] |  |  |  | abc:WorkInProgressAbstract | 
            
            
               | 29 |  | Schedule of Work In Process [Table Text Block] | [Concept] | Text Block (HTML) | For period |  | wip:ScheduleOfWorkInProcessTableTextBlock | 
            
            
               | 30 |  | Work In Process [Table] | [Table] |  |  |  | wip:WorkInProcessTable | 
            
            
               | 31 |  | Contract [Axis] | [Axis] |  |  |  | abc:ContractAxis | 
            
            
               | 32 |  | All Contracts [Domain] | [Member] |  |  |  | abc:AllContractsDomain | 
            
            
               | 33 |  | Highland Center [Member] | [Member] |  |  |  | abc:HighlandCenterMember | 
            
            
               | 34 |  | WT Plaza [Member] | [Member] |  |  |  | abc:WTPlazaMember | 
            
            
               | 35 |  | Plaza Center [Member] | [Member] |  |  |  | abc:PlazaCenterMember | 
            
            
               | 36 |  | Commerce Center [Member] | [Member] |  |  |  | abc:CommerceCenterMember | 
            
            
               | 37 |  | Silver Lake Center [Member] | [Member] |  |  |  | abc:SilverLakeCenterMember | 
            
            
               | 38 |  | Miscellaneous Contracts in Program Under $10,000,000 [Member] | [Member] |  |  |  | abc:MiscellaneousContractsInProgramUnder10000000Member | 
            
            
            
            
               | 39 |  | Contract Details [Line Items] | [Abstract] |  |  |  | wip:ContractDetailsLineItems | 
            
            
               | 40 |  | Contract Details [Set] | [Abstract] |  |  |  | abc:ContractDetailsSet | 
            
            
               | 41 |  | Contract Identifier | [Concept] | Text/String | For period |  | wip:ContractNumber | 
            
            
               | 42 |  | Contract Name | [Concept] | Text/String | For period |  | wip:ContractName | 
            
            
            
               | 43 |  | Estimated Revenues, Costs, and Gross Profit for Total Contract [Roll Up] | [Abstract] |  |  |  | abc:EstimatedRevenuesCostsGrossProfitForTotalContractRollUp | 
            
            
               | 44 |  | Contract Revenue, Estimated Revenue, Total | [Concept] | Monetary | As of | Credit | wip:ContractRevenueEstimatedRevenue | 
            
            
               | 45 |  | Contract Costs, Estimated Cost, Total | [Concept] | Monetary | As of | Debit | wip:ContractCostsEstimatedCost | 
            
            
               | 46 |  | Contract Gross Profit, Total Contract | [Concept] | Monetary | As of | Credit | wip:ContractGrossProfitTotalContract | 
            
            
            
               | 47 |  | Revenues, Costs and Gross Profit from Inception [Roll Up] | [Abstract] |  |  |  | abc:RevenuesCostsGrossProfitFromInceptionRollUp | 
            
            
               | 48 |  | Contract Revenue, Earned to Date | [Concept] | Monetary | As of | Credit | wip:ContractRevenueEarnedToDate | 
            
            
               | 49 |  | Contract Costs, Incurred to Date | [Concept] | Monetary | As of | Debit | wip:ContractCostsIncurredToDate | 
            
            
               | 50 |  | Contract Gross Profit, from Inception to Date | [Concept] | Monetary | As of | Credit | wip:ContractGrossProfitFromInceptionToDate | 
            
            
            
               | 51 |  | Billings From Inception [Set] | [Abstract] |  |  |  | abc:BillingsFromInceptionSet | 
            
            
               | 52 |  | Contract Billings, from Inception to Date | [Concept] | Monetary | As of | Credit | wip:ContractBillingsFromInceptionToDate | 
            
            
            
               | 53 |  | Completion Information [Set] | [Abstract] |  |  |  | abc:CompletionInformationSet | 
            
            
               | 54 |  | Contract Costs, Estimated Cost to Complete | [Concept] | Monetary | As of | Debit | wip:ContractCostsEstimatedCostToComplete | 
            
            
               | 55 |  | Percent Complete | [Concept] | Percent | As of |  | wip:PercentageComplete | 
            
            
               | 56 |  | Costs and Estimated Earnings in Excess of Billings, Net | [Concept] | Monetary | As of | Debit | wip:CostsAndEstimatedEarningsInExcessOfBillingsNet | 
            
            
            
               | 57 |  | Contract Details for Period [Abstract] | [Abstract] |  |  |  | wip:ContractCostsForPeriod | 
            
            
               | 58 |  | Revenues | [Concept] | Monetary | For period | Credit | us-gaap:Revenues | 
            
            
               | 59 |  | Cost of Revenue | [Concept] | Monetary | For period | Debit | us-gaap:CostOfRevenue | 
            
            
               | 60 |  | Gross Profit | [Concept] | Monetary | For period | Credit | us-gaap:GrossProfit | 
            
            
            
            
            
            
            
               | * |  | Network: 1600 - Disclosure - Summary (http://www.abc.com/role/Summary) | 
            
            
               | 61 |  | Under (Over) Billings Summary [Roll Up] | [Abstract] |  |  |  | abc:UnderOverBillingsSummaryRollUp | 
            
            
               | 62 |  | Costs and Estimated Earnings in Excess of Billings | [Concept] | Monetary | As of | Debit | wip:CostsAndEarningsInExcessOfBillings | 
            
            
               | 63 |  | Billings in Excess of Costs and Estimated Earnings | [Concept] | Monetary | As of | Credit | wip:BillingsInExcessOfCostAndEarnings | 
            
            
               | 64 |  | Costs and Estimated Earnings in Excess of Billings, Net | [Concept] | Monetary | As of | Debit | wip:CostsAndEstimatedEarningsInExcessOfBillingsNet |