<?xml version="1.0" encoding="utf-8"?>
<FilingSummary xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <Version>2.4.0.6</Version>
  <ProcessingTime />
  <ReportFormat>Html</ReportFormat>
  <ContextCount>14</ContextCount>
  <ElementCount>22</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>13</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>1</UnitCount>
  <MyReports>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0011 - Document - Document And Entity Information {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tiff.org/20120427/role/DocumentDocumentandEntityInformation</Role>
      <ShortName>Document And Entity Information</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>true</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>010005 - Document - Risk/Return Summary {Unlabeled} (TIFF Multi-Asset Fund (Prospectus Summary):)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tiff.org/20120427/role/RiskReturn_P0001-S000006387Member</Role>
      <ShortName>Risk/Return Summary  (TIFF Multi-Asset Fund (Prospectus Summary):)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>040000 - Disclosure - Risk/Return Detail Data {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/RiskReturnDetailData</Role>
      <ShortName>Risk/Return Detail Data</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>true</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>050005 - Document - Risk/Return Summary {Unlabeled} (TIFF Short-Term Fund (Prospectus Summary):)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tiff.org/20120427/role/RiskReturn_P0001-S000006388Member</Role>
      <ShortName>Risk/Return Summary  (TIFF Short-Term Fund (Prospectus Summary):)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>050040 - Disclosure - Risk/Return Detail Data {Elements} (TIFF Short-Term Fund (Prospectus Summary):)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.tiff.org/20120427/role/RiskReturnDetailData_P0001-S000006388Member</Role>
      <ShortName>Risk/Return Detail Data  (TIFF Short-Term Fund (Prospectus Summary):)</ShortName>
    </Report>
    <Report>
      <IsDefault>true</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <Logs />
  <InputFiles>
    <File>ck0000916622-20120427.xml</File>
    <File>ck0000916622-20120427.xsd</File>
    <File>ck0000916622-20120427_def.xml</File>
    <File>ck0000916622-20120427_lab.xml</File>
    <File>ck0000916622-20120427_pre.xml</File>
  </InputFiles>
  <SupplementalFiles>
    <File>ck0000916622-20120427_cal.xml</File>
  </SupplementalFiles>
  <BaseTaxonomies />
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>
