2.4.0.8016 - Disclosure - Significant Subsidiaries (Tables)truefalsefalse1false falsefalseContext_FYE_31-Mar-2013http://www.sec.gov/CIK0000911568duration2012-04-01T00:00:002013-03-31T00:00:001true 1bftcviii_SignificantSubsidiariesAbstractbftcviii_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Significant Subsidiaries [Abstract]2false 2us-gaap_EquityMethodInvestmentsTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00<p style="text-transform: none; text-indent: 0px; margin: 0in 0in 0pt; font: 11pt calibri, sans-serif; white-space: normal; letter-spacing: normal; color: #000000; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="msonormal">The following Local Limited Partnership invested in by the Fund represents more than 20% of the Fund’s total assets or equity as of March 31, 2013 or 2012 or net losses for the years ended either March 31, 2013 or 2012.  The following financial information represents the performance of this Local Limited Partnership for the years ended December 31, 2012 and 2011: <p style="text-transform: none; text-indent: 0px; margin: 0in 0in 0pt; font: 11pt calibri, sans-serif; white-space: normal; letter-spacing: normal; color: #000000; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="msonormal">  <table style="text-transform: none; text-indent: 0px; width: 100%; font-family: 'times new roman'; letter-spacing: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="msonormaltable" border="0" cellspacing="0" cellpadding="0"> <tr> <td style="padding: 0in;" valign="bottom"> Oak Knoll Renaissance, Limited Partnership </td> <td style="padding-bottom: 1.5pt; padding-left: 0in; padding-right: 0in; padding-top: 0in;" valign="bottom">   </td> <td style="padding-bottom: 1.5pt; padding-left: 0in; padding-right: 0in; padding-top: 0in;" valign="bottom" colspan="2"> 2012 </td> <td style="padding-bottom: 1.5pt; padding-left: 0in; padding-right: 0in; padding-top: 0in;" valign="bottom" nowrap="nowrap">   </td> <td style="padding-bottom: 1.5pt; padding-left: 0in; padding-right: 0in; padding-top: 0in;" valign="bottom">   </td> <td style="padding-bottom: 1.5pt; padding-left: 0in; padding-right: 0in; padding-top: 0in;" valign="bottom" colspan="2"> 2011 </td> <td style="padding-bottom: 1.5pt; padding-left: 0in; padding-right: 0in; padding-top: 0in;" valign="bottom" nowrap="nowrap">   </td> </tr> <tr> <td style="width: 1435px; padding: 0in;" valign="bottom" width="76%"> Total Assets </td> <td style="width: 19px; padding: 0in;" valign="bottom" width="1%">   </td> <td style="width: 19px; padding: 0in;" valign="bottom" width="1%">   </td> <td style="width: 170px; padding: 0in;" valign="bottom" width="9%"> N/A </td> <td style="width: 19px; padding: 0in;" valign="bottom" width="1%" nowrap="nowrap">   </td> <td style="width: 19px; padding: 0in;" valign="bottom" width="1%">   </td> <td style="width: 19px; padding: 0in;" valign="bottom" width="1%"> $ </td> <td style="width: 169px; padding: 0in;" valign="bottom" width="9%"> 6,645,210 </td> <td style="width: 18px; padding: 0in;" valign="bottom" width="1%" nowrap="nowrap">   </td> </tr> <tr> <td style="width: 1435px; padding: 0in;" valign="bottom" width="76%"> Total Liabilities </td> <td style="width: 19px; padding: 0in;" valign="bottom" width="1%">   </td> <td style="width: 19px; padding: 0in;" valign="bottom" width="1%">   </td> <td style="width: 170px; padding: 0in;" valign="bottom" width="9%"> N/A </td> <td style="width: 19px; padding: 0in;" valign="bottom" width="1%" nowrap="nowrap">   </td> <td style="width: 19px; padding: 0in;" valign="bottom" width="1%">   </td> <td style="width: 19px; padding: 0in;" valign="bottom" width="1%"> $ </td> <td style="width: 169px; padding: 0in;" valign="bottom" width="9%"> 3,117,148 </td> <td style="width: 18px; padding: 0in;" valign="bottom" width="1%" nowrap="nowrap">   </td> </tr> <tr> <td style="width: 1435px; padding: 0in;" valign="bottom" width="76%"> Revenue </td> <td style="width: 19px; padding: 0in;" valign="bottom" width="1%">   </td> <td style="width: 19px; padding: 0in;" valign="bottom" width="1%">   </td> <td style="width: 170px; padding: 0in;" valign="bottom" width="9%"> N/A </td> <td style="width: 19px; padding: 0in;" valign="bottom" width="1%" nowrap="nowrap">   </td> <td style="width: 19px; padding: 0in;" valign="bottom" width="1%">   </td> <td style="width: 19px; padding: 0in;" valign="bottom" width="1%"> $ </td> <td style="width: 169px; padding: 0in;" valign="bottom" width="9%"> 2,102,268 </td> <td style="width: 18px; padding: 0in;" valign="bottom" width="1%" nowrap="nowrap">   </td> </tr> <tr> <td style="width: 1435px; padding: 0in;" valign="bottom" width="76%"> Net Income   </td> <td style="width: 19px; padding: 0in;" valign="bottom" width="1%">   </td> <td style="width: 19px; padding: 0in;" valign="bottom" width="1%">   </td> <td style="width: 170px; padding: 0in;" valign="bottom" width="9%"> N/A </td> <td style="width: 19px; padding: 0in;" valign="bottom" width="1%" nowrap="nowrap">   </td> <td style="width: 19px; padding: 0in;" valign="bottom" width="1%">   </td> <td style="width: 19px; padding: 0in;" valign="bottom" width="1%"> $ </td> <td style="width: 169px; padding: 0in;" valign="bottom" width="9%"> 151,064 </td> <td style="width: 18px; padding: 0in;" valign="bottom" width="1%" nowrap="nowrap">   </td> </tr> </table>falsefalsefalsenonnum:textBlockItemTypenaTabular disclosure of equity method investments in common stock. The disclosure may include: (a) the name of each investee or group of investments for which combined disclosure is appropriate, (2) the percentage ownership of common stock, (3) the difference, if any, between the carrying amount of an investment and the value of the underlying equity in the net assets and the accounting treatment of difference, if any, and (4) the aggregate value of each identified investment based on its quoted market price, if available.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false0Schedule of Equity Method Investments [Table Text Block]falseSignificant Subsidiaries (Tables)UnKnownUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.bostonfinancial.com/role/SignificantSubsidiariesTables12