2.4.0.8 HtmlAndXml 42 124 1 false 13 0 false 5 false false R1.htm 001 - Document - DOCUMENT AND ENTITY INFORMATION Sheet http://www.bostonfinancial.com/role/DocumentAndEntityInformation DOCUMENT AND ENTITY INFORMATION R1.xml true false R2.htm 002 - Statement - BALANCE SHEETS Sheet http://www.bostonfinancial.com/role/BALANCESHEETS BALANCE SHEETS R2.xml false false R3.htm 003 - Statement - STATEMENTS OF OPERATIONS Sheet http://www.bostonfinancial.com/role/STATEMENTSOFOPERATIONS STATEMENTS OF OPERATIONS R3.xml false false R4.htm 004 - Statement - STATEMENTS OF OPERATIONS [Parenthetical] Sheet http://www.bostonfinancial.com/role/STATEMENTSOFOPERATIONSParenthetical STATEMENTS OF OPERATIONS [Parenthetical] R4.xml false false R5.htm 005 - Statement - STATEMENTS OF CHANGES IN PARTNERS' EQUITY Sheet http://www.bostonfinancial.com/role/STATEMENTSOFCHANGESINPARTNERSEQUITY STATEMENTS OF CHANGES IN PARTNERS' EQUITY R5.xml false false R6.htm 006 - Statement - STATEMENTS OF CASH FLOWS Sheet http://www.bostonfinancial.com/role/STATEMENTSOFCASHFLOWS STATEMENTS OF CASH FLOWS R6.xml false false R7.htm 007 - Disclosure - Organization Sheet http://www.bostonfinancial.com/role/Organization Organization R7.xml false false R8.htm 008 - Disclosure - Significant Accounting Policies Sheet http://www.bostonfinancial.com/role/SignificantAccountingPolicies Significant Accounting Policies R8.xml false false R9.htm 009 - Disclosure - Investments in Local Limited Partnership Sheet http://www.bostonfinancial.com/role/InvestmentInLocalLimitedPartnership Investments in Local Limited Partnership R9.xml false false R10.htm 010 - Disclosure - Transactions with Affiliates Sheet http://www.bostonfinancial.com/role/TransactionsWithAffiliates Transactions with Affiliates R10.xml false false R11.htm 011 - Disclosure - Federal Income Taxes Sheet http://www.bostonfinancial.com/role/FederalIncomeTaxes Federal Income Taxes R11.xml false false R12.htm 012 - Disclosure - Significant Subsidiaries Sheet http://www.bostonfinancial.com/role/SignificantSubsidiaries Significant Subsidiaries R12.xml false false R13.htm 013 - Disclosure - Significant Accounting Policies (Policies) Sheet http://www.bostonfinancial.com/role/SignificantAccountingPoliciesPolicies Significant Accounting Policies (Policies) R13.xml false false R14.htm 014 - Disclosure - Investments in Local Limited Partnerships (Tables) Sheet http://www.bostonfinancial.com/role/InvestmentsInLocalLimitedPartnershipsTables Investments in Local Limited Partnerships (Tables) R14.xml false false R15.htm 015 - Disclosure - Federal Income Taxes (Tables) Sheet http://www.bostonfinancial.com/role/FederalIncomeTaxesTables Federal Income Taxes (Tables) R15.xml false false R16.htm 016 - Disclosure - Significant Subsidiaries (Tables) Sheet http://www.bostonfinancial.com/role/SignificantSubsidiariesTables Significant Subsidiaries (Tables) R16.xml false false R17.htm 017 - Disclosure - Organization (Details Textual) Sheet http://www.bostonfinancial.com/role/OrganizationDetailsTextual Organization (Details Textual) R17.xml false false R18.htm 018 - Disclosure - Significant Accounting Policies (Details Textual) Sheet http://www.bostonfinancial.com/role/SignificantAccountingPoliciesDetailsTextual Significant Accounting Policies (Details Textual) R18.xml false false R19.htm 019 - Disclosure - Investments in Local Limited Partnerships (Details) Sheet http://www.bostonfinancial.com/role/InvestmentsInLocalLimitedPartnershipsDetails Investments in Local Limited Partnerships (Details) R19.xml false false R20.htm 020 - Disclosure - Investments in Local Limited Partnerships (Details 1) Sheet http://www.bostonfinancial.com/role/InvestmentsInLocalLimitedPartnershipsDetails1 Investments in Local Limited Partnerships (Details 1) R20.xml false false R21.htm 021 - Disclosure - Investments in Local Limited Partnerships (Details 2) Sheet http://www.bostonfinancial.com/role/InvestmentsInLocalLimitedPartnershipsDetails2 Investments in Local Limited Partnerships (Details 2) R21.xml false false R22.htm 022 - Disclosure - Investments in Local Limited Partnerships (Details Textual) Sheet http://www.bostonfinancial.com/role/InvestmentsInLocalLimitedPartnershipsDetailsTextual Investments in Local Limited Partnerships (Details Textual) R22.xml false false R23.htm 023 - Disclosure - Transactions with Affiliates (Details Textual) Sheet http://www.bostonfinancial.com/role/TransactionsWithAffiliatesDetailsTextual Transactions with Affiliates (Details Textual) R23.xml false false R24.htm 024 - Disclosure - Federal Income Taxes (Details) Sheet http://www.bostonfinancial.com/role/FederalIncomeTaxesDetails Federal Income Taxes (Details) R24.xml false false R25.htm 025 - Disclosure - Federal Income Taxes (Details 1) Sheet http://www.bostonfinancial.com/role/FederalIncomeTaxesDetails1 Federal Income Taxes (Details 1) R25.xml false false R26.htm 026 - Disclosure - Federal Income Taxes (Details Textual) Sheet http://www.bostonfinancial.com/role/FederalIncomeTaxesDetailsTextual Federal Income Taxes (Details Textual) R26.xml false false R27.htm 027 - Disclosure - Significant Subsidiaries (Details) Sheet http://www.bostonfinancial.com/role/SignificantSubsidiariesDetails Significant Subsidiaries (Details) R27.xml false false R28.htm 028 - Disclosure - Significant Subsidiaries (Details Textual) Sheet http://www.bostonfinancial.com/role/SignificantSubsidiariesDetailsTextual Significant Subsidiaries (Details Textual) R28.xml false false All Reports Book All Reports Process Flow-Through: 002 - Statement - BALANCE SHEETS Process Flow-Through: Removing column 'Mar. 31, 2011' Process Flow-Through: 003 - Statement - STATEMENTS OF OPERATIONS Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2012' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2011' Process Flow-Through: 004 - Statement - STATEMENTS OF OPERATIONS [Parenthetical] Process Flow-Through: 006 - Statement - STATEMENTS OF CASH FLOWS Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2012' Process Flow-Through: Removing column '12 Months Ended Dec. 31, 2011' bftcviii-20130331.xml bftcviii-20130331.xsd bftcviii-20130331_cal.xml bftcviii-20130331_def.xml bftcviii-20130331_lab.xml bftcviii-20130331_pre.xml true true