<?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>91</ContextCount>
  <ElementCount>190</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>30</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>7</UnitCount>
  <MyReports>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>101 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/DocumentDocumentandEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
    </Report>
    <Report>
      <IsDefault>true</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>103 - Statement - BALANCE SHEETS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/StatementOfFinancialPositionUnclassified-RealEstateOperations</Role>
      <ShortName>BALANCE SHEETS</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>104 - Statement - BALANCE SHEETS (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/StatementOfFinancialPositionUnclassified-RealEstateOperationsParenthetical</Role>
      <ShortName>BALANCE SHEETS (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>105 - Statement - STATEMENTS OF INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/StatementOfIncomeRealEstateExcludingREITs</Role>
      <ShortName>STATEMENTS OF INCOME</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>106 - Statement - STATEMENTS OF INCOME (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/StatementOfIncomeRealEstateExcludingREITsParenthetical</Role>
      <ShortName>STATEMENTS OF INCOME (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>107 - Statement - STATEMENT OF MEMBERS DEFICIENCY</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/StatementOfShareholdersEquityAndOtherComprehensiveIncome</Role>
      <ShortName>STATEMENT OF MEMBERS DEFICIENCY</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>108 - Statement - STATEMENTS OF CASH FLOWS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/StatementOfCashFlowsIndirectRealEstate</Role>
      <ShortName>STATEMENTS OF CASH FLOWS</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>109 - Disclosure - Business Activity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/NotesToFinancialStatementsBusinessDescriptionAndBasisOfPresentationTextBlock</Role>
      <ShortName>Business Activity</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>110 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/NotesToFinancialStatementsSignificantAccountingPoliciesTextBlock</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>111 - Disclosure - Mortgages Payable</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/NotesToFinancialStatementsMortgageNotesPayableDisclosureTextBlock</Role>
      <ShortName>Mortgages Payable</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>112 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/NotesToFinancialStatementsFairValueDisclosuresTextBlock</Role>
      <ShortName>Fair Value Measurements</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>113 - Disclosure - Related Party Transactions - Rent Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/NotesToFinancialStatementsRelatedPartyTransactionsRentIncomeTextBlock</Role>
      <ShortName>Related Party Transactions - Rent Income</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>114 - Disclosure - Related Party Transactions-Supervisory and Other Services</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/NotesToFinancialStatementsRelatedPartyTransactionsDisclosureTextBlock</Role>
      <ShortName>Related Party Transactions-Supervisory and Other Services</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>115 - Disclosure - Number of Participants</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/NotesToFinancialStatementsNumberOfParticipantsTextBlock</Role>
      <ShortName>Number of Participants</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>116 - Disclosure - Determination of Distributions to Participants</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/NotesToFinancialStatementsDeterminationOfDistributionsToParticipantsTextBlock</Role>
      <ShortName>Determination of Distributions to Participants</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>117 - Disclosure - Distributions and Amount of Income per $10,000 Participation Unit</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/NotesToFinancialStatementsDistributionsAndAmountOfIncomePerParticipationUnitTextBlock</Role>
      <ShortName>Distributions and Amount of Income per $10,000 Participation Unit</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>118 - Disclosure - Concentration of Credit Risk</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/NotesToFinancialStatementsConcentrationRiskDisclosureTextBlock</Role>
      <ShortName>Concentration of Credit Risk</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>119 - Disclosure - Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlock</Role>
      <ShortName>Contingencies</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>120 - Disclosure - Building Improvements Program and Agreement to Extend Lease</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/NotesToFinancialStatementsBuildingImprovementsProgramAndAgreementToExtendLeaseTextBlock</Role>
      <ShortName>Building Improvements Program and Agreement to Extend Lease</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>121 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/NotesToFinancialStatementsSubsequentEventsTextBlock</Role>
      <ShortName>Subsequent Events</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>122 - Disclosure - Schedule III - Real Estate and Accumulated Depreciation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/NotesToFinancialStatementsRealEstateAndAccumulatedDepreciationDisclosureTextBlock</Role>
      <ShortName>Schedule III - Real Estate and Accumulated Depreciation</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>123 - Disclosure - Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/NotesToFinancialStatementsSignificantAccountingPoliciesTextBlockPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies (Policies)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>124 - Disclosure - Summary of Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/NotesToFinancialStatementsSignificantAccountingPoliciesTextBlockTables</Role>
      <ShortName>Summary of Significant Accounting Policies (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>125 - Disclosure - Mortgages Payable (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/NotesToFinancialStatementsMortgageNotesPayableDisclosureTextBlockTables</Role>
      <ShortName>Mortgages Payable (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>126 - Disclosure - Related Party Transactions - Rent Income (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/NotesToFinancialStatementsRelatedPartyTransactionsRentIncomeTextBlockTables</Role>
      <ShortName>Related Party Transactions - Rent Income (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>127 - Disclosure - Distributions and Amount of Income per $10,000 Participation Unit (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/NotesToFinancialStatementsDistributionsAndAmountOfIncomePerParticipationUnitTextBlockTables</Role>
      <ShortName>Distributions and Amount of Income per $10,000 Participation Unit (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>128 - Disclosure - Business Activity - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/DisclosureBusinessActivityAdditionalInformation</Role>
      <ShortName>Business Activity - Additional Information (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>129 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformation</Role>
      <ShortName>Summary of Significant Accounting Policies - Additional Information (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>130 - Disclosure - Summary of Significant Accounting Policies - Effect of Correction on Combined Financial Statements (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesEffectOfCorrectionOnCombinedFinancialStatements</Role>
      <ShortName>Summary of Significant Accounting Policies - Effect of Correction on Combined Financial Statements (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>131 - Disclosure - Mortgages Payable - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/DisclosureMortgagesPayableAdditionalInformation</Role>
      <ShortName>Mortgages Payable - Additional Information (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>132 - Disclosure - Mortgages Payable - Schedule of Principal Payments on Mortgages (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/DisclosureMortgagesPayableScheduleOfPrincipalPaymentsOnMortgages</Role>
      <ShortName>Mortgages Payable - Schedule of Principal Payments on Mortgages (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>133 - Disclosure - Fair Value Measurements - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/DisclosureFairValueMeasurementsAdditionalInformation</Role>
      <ShortName>Fair Value Measurements - Additional Information (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>134 - Disclosure - Related Party Transactions - Rent Income - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/DisclosureRelatedPartyTransactionsRentIncomeAdditionalInformation</Role>
      <ShortName>Related Party Transactions - Rent Income - Additional Information (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>135 - Disclosure - Related Party Transactions - Rent Income - Schedule of Rent Income (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/DisclosureRelatedPartyTransactionsRentIncomeScheduleOfRentIncome</Role>
      <ShortName>Related Party Transactions - Rent Income - Schedule of Rent Income (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>136 - Disclosure - Related Party Transactions - Rent Income - Schedule of Future Minimum Rental Income (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/DisclosureRelatedPartyTransactionsRentIncomeScheduleOfFutureMinimumRentalIncome</Role>
      <ShortName>Related Party Transactions - Rent Income - Schedule of Future Minimum Rental Income (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>137 - Disclosure - Related Party Transactions - Rent Income - Schedule of Future Minimum Rental Income (Parenthetical) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/DisclosureRelatedPartyTransactionsRentIncomeScheduleOfFutureMinimumRentalIncomeParenthetical</Role>
      <ShortName>Related Party Transactions - Rent Income - Schedule of Future Minimum Rental Income (Parenthetical) (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>138 - Disclosure - Related Party Transactions - Supervisory and Other Services - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/DisclosureRelatedPartyTransactionsSupervisoryAndOtherServicesAdditionalInformation</Role>
      <ShortName>Related Party Transactions - Supervisory and Other Services - Additional Information (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>139 - Disclosure - Number of Participants - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/DisclosureNumberOfParticipantsAdditionalInformation</Role>
      <ShortName>Number of Participants - Additional Information (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>140 - Disclosure - Distributions and Amount of Income Per Ten Thousand Participation Unit - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/DisclosureDistributionsAndAmountOfIncomePerTenThousandParticipationUnitAdditionalInformation</Role>
      <ShortName>Distributions and Amount of Income Per Ten Thousand Participation Unit - Additional Information (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>141 - Disclosure - Distributions and Amount of Income Per Ten Thousand Participation Unit - Schedule of Distributions and Amount of Income Per Participation Unit (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/DisclosureDistributionsAndAmountOfIncomePerTenThousandParticipationUnitScheduleOfDistributionsAndAmountOfIncomePerParticipationUnit</Role>
      <ShortName>Distributions and Amount of Income Per Ten Thousand Participation Unit - Schedule of Distributions and Amount of Income Per Participation Unit (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>142 - Disclosure - Concentration of Credit Risk - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/DisclosureConcentrationOfCreditRiskAdditionalInformation</Role>
      <ShortName>Concentration of Credit Risk - Additional Information (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>143 - Disclosure - Contingencies - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/DisclosureContingenciesAdditionalInformation</Role>
      <ShortName>Contingencies - Additional Information (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>144 - Disclosure - Building Improvements Program and Agreement to Extend Lease - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/DisclosureBuildingImprovementsProgramAndAgreementToExtendLeaseAdditionalInformation</Role>
      <ShortName>Building Improvements Program and Agreement to Extend Lease - Additional Information (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>145 - Disclosure - Schedule III - Real Estate and Accumulated Depreciation (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://eastas.com/taxonomy/role/DisclosureScheduleIiiRealEstateAndAccumulatedDepreciation</Role>
      <ShortName>Schedule III - Real Estate and Accumulated Depreciation (Detail)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <Logs>
    <Log type="Info">'Monetary' elements on report '143 - Disclosure - Contingencies - Additional Information (Detail)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">Process Flow-Through: 103 - Statement - BALANCE SHEETS</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2010'</Log>
    <Log type="Info">Process Flow-Through: 104 - Statement - BALANCE SHEETS (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 105 - Statement - STATEMENTS OF INCOME</Log>
    <Log type="Info">Process Flow-Through: 106 - Statement - STATEMENTS OF INCOME (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 107 - Statement - STATEMENT OF MEMBERS DEFICIENCY</Log>
    <Log type="Info">Process Flow-Through: 108 - Statement - STATEMENTS OF CASH FLOWS</Log>
  </Logs>
  <InputFiles>
    <File>eastas-20121231.xml</File>
    <File>eastas-20121231.xsd</File>
    <File>eastas-20121231_cal.xml</File>
    <File>eastas-20121231_def.xml</File>
    <File>eastas-20121231_lab.xml</File>
    <File>eastas-20121231_pre.xml</File>
  </InputFiles>
  <SupplementalFiles />
  <BaseTaxonomies />
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
