<?xml version='1.0' encoding='UTF-8'?>
<FilingSummary>
  <Version>3.5.0.2</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>136</ContextCount>
  <ElementCount>202</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>52</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>4</UnitCount>
  <MyReports>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>000000 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/DocumentEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>000100 - Statement - Condensed Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/BalanceSheet</Role>
      <ShortName>Condensed Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>000200 - Statement - Condensed Consolidated Balance Sheets (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/BalanceSheetsParentheticals</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>000300 - Statement - Condensed Consolidated Statements of Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/StatementOfOperations</Role>
      <ShortName>Condensed Consolidated Statements of Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>000400 - Statement - Condensed Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/StatementOfCashFlows</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>000500 - Statement - Condensed Consolidated Statements of Changes in Partners' Capital</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/StatementOfOwnersNetInvestment</Role>
      <ShortName>Condensed Consolidated Statements of Changes in Partners' Capital</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>100100 - Disclosure - Description of Business</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/DescriptionOfBusiness</Role>
      <ShortName>Description of Business</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>100200 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/SummaryOfSignificantAccountingPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>100400 - Disclosure - Cash and Cash Equivalents</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/CashAndCashEquivalents</Role>
      <ShortName>Cash and Cash Equivalents</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>100600 - Disclosure - Vessels, Net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/VesselsNet</Role>
      <ShortName>Vessels, Net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>100800 - Disclosure - Intangible Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/IntangibleAssets</Role>
      <ShortName>Intangible Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>101100 - Disclosure - Long-Term Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/LongTermDebt</Role>
      <ShortName>Long-Term Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>101200 - Disclosure - Fair Value of Financial Instruments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/FairValueOfFinancialInstruments</Role>
      <ShortName>Fair Value of Financial Instruments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>101400 - Disclosure - Transactions With Related Parties</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/TransactionsWithRelatedParties</Role>
      <ShortName>Transactions With Related Parties</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>101500 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/CommitmentsAndContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>101600 - Disclosure - Segment Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/SegmentInformation</Role>
      <ShortName>Segment Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>101700 - Disclosure - Issuance of Units</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/IssuanceOfUnitsDisclosure</Role>
      <ShortName>Issuance of Units</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>101800 - Disclosure - Cash Distributions and Earnings/ (Losses) per unit</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/CashDistributionsAndEarningsPerUnit</Role>
      <ShortName>Cash Distributions and Earnings/ (Losses) per unit</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>101900 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>102000 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/SubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>200200 - Disclosure - Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/SignificantAccountingPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.navios-midstream.com/20160630/role/SummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>21</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>300200 - Disclosure - Summary Of Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/SummaryOfSignificantAccountingPoliciesTables</Role>
      <ShortName>Summary Of Significant Accounting Policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>300400 - Disclosure - Cash and Cash Equivalents (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/CashAndCashEquivalentsTables</Role>
      <ShortName>Cash and Cash Equivalents (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.navios-midstream.com/20160630/role/CashAndCashEquivalents</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>300600 - Disclosure - Vessels, Net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/VesselsNetTables</Role>
      <ShortName>Vessels, Net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.navios-midstream.com/20160630/role/VesselsNet</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>300800 - Disclosure - Intangible Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/IntangibleAssetsTables</Role>
      <ShortName>Intangible Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.navios-midstream.com/20160630/role/IntangibleAssets</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>301100 - Disclosure - Long-Term Debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/LongTermDebtTables</Role>
      <ShortName>Long-Term Debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.navios-midstream.com/20160630/role/LongTermDebt</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>301200 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/FairValueMeasurementsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>301800 - Disclosure - Cash Distributions and Earnings/ (Losses) Per Unit (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/CashDistributionsAndEarningsLossesPerUnitTables</Role>
      <ShortName>Cash Distributions and Earnings/ (Losses) Per Unit (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.navios-midstream.com/20160630/role/CashDistributionsAndEarningsPerUnit</ParentRole>
      <Position>28</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>400100 - Disclosure - Description of Business (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/DescriptionOfBusinessDetails</Role>
      <ShortName>Description of Business (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.navios-midstream.com/20160630/role/DescriptionOfBusiness</ParentRole>
      <Position>29</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>400200 - Disclosure - Summary Of Significant Accounting Policies - Subsidiaries (Tables) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/SummaryOfSignificantAccountingPoliciesSubsidiariesTablesDetails</Role>
      <ShortName>Summary Of Significant Accounting Policies - Subsidiaries (Tables) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>400400 - Disclosure - Cash And Cash Equivalents (Table) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/CashAndCashEquivalentsTableDetails</Role>
      <ShortName>Cash And Cash Equivalents (Table) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>400600 - Disclosure - Vessels, Net (Table) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/VesselsNetTableDetails</Role>
      <ShortName>Vessels, Net (Table) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.navios-midstream.com/20160630/role/VesselsNetTables</ParentRole>
      <Position>32</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>400800 - Disclosure - Intangible Assets - Schedule (Table) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/IntangibleAssetsScheduleTableDetails</Role>
      <ShortName>Intangible Assets - Schedule (Table) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>400810 - Disclosure - Intangible Assets - Amortization Expense (Table) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/IntangibleAssetsAmortizationExpenseTableDetails</Role>
      <ShortName>Intangible Assets - Amortization Expense (Table) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>400820 - Disclosure - Intangible Assets - Aggregate  Amortization (Table) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/IntangibleAssetsAggregateAmortizationsTableDetails</Role>
      <ShortName>Intangible Assets - Aggregate  Amortization (Table) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>400840 - Disclosure - Intangible Assets - Amortization Period (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/IntangibleAssetsAmortizationPeriodDetails</Role>
      <ShortName>Intangible Assets - Amortization Period (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>401100 - Disclosure - Long-Term Debt (Table) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/LongTermDebtTableDetails</Role>
      <ShortName>Long-Term Debt (Table) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.navios-midstream.com/20160630/role/LongTermDebtTables</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>401150 - Disclosure - Long Term Debt - Obligations (Table) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/LongTernDebtObligationsTableDetails</Role>
      <ShortName>Long Term Debt - Obligations (Table) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>401160 - Disclosure - Long-Term Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/LongTermDebtDetails</Role>
      <ShortName>Long-Term Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.navios-midstream.com/20160630/role/LongTermDebtTables</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>401200 - Disclosure - Fair Value Of Financial Instruments - Schedule (Table) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/FairValueOfFinancialInstrumentsScheduleTableDetails</Role>
      <ShortName>Fair Value Of Financial Instruments - Schedule (Table) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>401210 - Disclosure - Fair Value Of Financial Instruments - Recurring Basis (Table) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/FairValueOfFinancialInstrumentsReccuringBasisTableDetails</Role>
      <ShortName>Fair Value Of Financial Instruments - Recurring Basis (Table) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>401430 - Disclosure - Transactions With Related Parties (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/TransactionsWithRelatedPartiesDetails</Role>
      <ShortName>Transactions With Related Parties (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.navios-midstream.com/20160630/role/TransactionsWithRelatedParties</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>401440 - Disclosure - Transactions with Related Parties - Backstop Agreement (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/TransactionsWithRelatedPartiesBackstopAgreementDetails</Role>
      <ShortName>Transactions with Related Parties - Backstop Agreement (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>401460 - Disclosure - Transactions With Related Parties - Option Vessels (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/TransactionsWithRelatedPartiesOptionVesselsDetails</Role>
      <ShortName>Transactions With Related Parties - Option Vessels (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>401700 - Disclosure - Issuance Of Units (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/IssuanceOfUnits</Role>
      <ShortName>Issuance Of Units (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>401800 - Disclosure - Cash Distributions and Earnings / (Losses) Per Unit (Table) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/CashDistributionsAndEarningsLossesPerUnitTableDetails</Role>
      <ShortName>Cash Distributions and Earnings / (Losses) Per Unit (Table) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.navios-midstream.com/20160630/role/CashDistributionsAndEarningsLossesPerUnitTables</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>401810 - Disclosure - Cash Distributions and Earnings Per Unit (Table) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/CashDistributionsAndEarningsPerUnitTableDetails</Role>
      <ShortName>Cash Distributions and Earnings Per Unit (Table) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>401830 - Disclosure - Cash Distributions and Earnings / (Losses) Per Unit (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/CashDistributionsAndEarningsPerUnitDetails</Role>
      <ShortName>Cash Distributions and Earnings / (Losses) Per Unit (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.navios-midstream.com/20160630/role/CashDistributionsAndEarningsLossesPerUnitTables</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="nap-20160630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>402000 - Disclosure - Subsequent Events (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.navios-midstream.com/20160630/role/SubsequentEventsDetails</Role>
      <ShortName>Subsequent Events (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.navios-midstream.com/20160630/role/SubsequentEvents</ParentRole>
      <Position>49</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>nap-20160630.xml</File>
    <File>nap-20160630.xsd</File>
    <File>nap-20160630_cal.xml</File>
    <File>nap-20160630_def.xml</File>
    <File>nap-20160630_lab.xml</File>
    <File>nap-20160630_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies/>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
