<?xml version='1.0' encoding='UTF-8'?>
<FilingSummary>
  <Version>3.10.0.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>374</ContextCount>
  <ElementCount>456</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>114</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>15</UnitCount>
  <MyReports>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>0001000 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/DocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>1001000 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/ConsolidatedBalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>1001501 - Statement - Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/ConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>1002000 - Statement - Consolidated Statements of Operations and Comprehensive Income</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/ConsolidatedStatementsOfOperationsAndComprehensiveIncome</Role>
      <ShortName>Consolidated Statements of Operations and Comprehensive Income</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>1003000 - Statement - Consolidated Statement of Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/ConsolidatedStatementOfStockholdersEquity</Role>
      <ShortName>Consolidated Statement of Stockholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>1004000 - Statement - Consolidated Statements of Partners' Capital</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/ConsolidatedStatementsOfPartnersCapital</Role>
      <ShortName>Consolidated Statements of Partners' Capital</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>1005000 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/ConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>2101100 - Disclosure - Organization</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/Organization</Role>
      <ShortName>Organization</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>2102100 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/SummaryOfSignificantAccountingPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>2108100 - Disclosure - Investments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/Investments</Role>
      <ShortName>Investments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>2111100 - Disclosure - Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/Debt</Role>
      <ShortName>Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>2113100 - Disclosure - Stockholders' Equity and Partners' Capital</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/StockholdersEquityAndPartnersCapital</Role>
      <ShortName>Stockholders' Equity and Partners' Capital</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>2116100 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/CommitmentsAndContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>2117100 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/FairValueMeasurements</Role>
      <ShortName>Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>2121100 - Disclosure - Discontinued Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/DiscontinuedOperations</Role>
      <ShortName>Discontinued Operations</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>2123100 - Disclosure - Incentive Award Plan</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/IncentiveAwardPlan</Role>
      <ShortName>Incentive Award Plan</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>2126100 - Disclosure - Income Per Share and Partnership Unit</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/IncomePerShareAndPartnershipUnit</Role>
      <ShortName>Income Per Share and Partnership Unit</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>2128100 - Disclosure - Related Party Transactions and Arrangements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/RelatedPartyTransactionsAndArrangements</Role>
      <ShortName>Related Party Transactions and Arrangements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>2129100 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/SubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>2202201 - Disclosure - Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/SummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.spiritrealty.com/role/SummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>20</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>2302302 - Disclosure - Summary of Significant Accounting Policies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/SummaryOfSignificantAccountingPoliciesTables</Role>
      <ShortName>Summary of Significant Accounting Policies (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.spiritrealty.com/role/SummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>21</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>2308301 - Disclosure - Investments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/InvestmentsTables</Role>
      <ShortName>Investments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.spiritrealty.com/role/Investments</ParentRole>
      <Position>22</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>2311301 - Disclosure - Debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/DebtTables</Role>
      <ShortName>Debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.spiritrealty.com/role/Debt</ParentRole>
      <Position>23</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>2313301 - Disclosure - Stockholders' Equity and Partners' Capital (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/StockholdersEquityAndPartnersCapitalTables</Role>
      <ShortName>Stockholders' Equity and Partners' Capital (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.spiritrealty.com/role/StockholdersEquityAndPartnersCapital</ParentRole>
      <Position>24</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>2317301 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/FairValueMeasurementsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.spiritrealty.com/role/FairValueMeasurements</ParentRole>
      <Position>25</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>2321301 - Disclosure - Discontinued Operations (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/DiscontinuedOperationsTables</Role>
      <ShortName>Discontinued Operations (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.spiritrealty.com/role/DiscontinuedOperations</ParentRole>
      <Position>26</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>2326301 - Disclosure - Income Per Share and Partnership Unit (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/IncomePerShareAndPartnershipUnitTables</Role>
      <ShortName>Income Per Share and Partnership Unit (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.spiritrealty.com/role/IncomePerShareAndPartnershipUnit</ParentRole>
      <Position>27</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>2401401 - Disclosure - Organization - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/OrganizationNarrativeDetails</Role>
      <ShortName>Organization - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>2402403 - Disclosure - Summary of Significant Accounting Policies - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/SummaryOfSignificantAccountingPoliciesNarrativeDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>2402404 - Disclosure - Summary of Significant Accounting Policies - Schedule of Cash, Cash Equivalents and Restricted Cash (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/SummaryOfSignificantAccountingPoliciesScheduleOfCashCashEquivalentsAndRestrictedCashDetails</Role>
      <ShortName>Summary of Significant Accounting Policies - Schedule of Cash, Cash Equivalents and Restricted Cash (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>2408402 - Disclosure - Investments - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/InvestmentsNarrativeDetails</Role>
      <ShortName>Investments - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>2408403 - Disclosure - Investments - Summary of Real Estate and Loan Activity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/InvestmentsSummaryOfRealEstateAndLoanActivityDetails</Role>
      <ShortName>Investments - Summary of Real Estate and Loan Activity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>2408404 - Disclosure - Investments - Summary of Real Estate and Loan Activity (Footnote) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/InvestmentsSummaryOfRealEstateAndLoanActivityFootnoteDetails</Role>
      <ShortName>Investments - Summary of Real Estate and Loan Activity (Footnote) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>2408405 - Disclosure - Investments - Schedule of Minimum Future Contractual Rent to be Received (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/InvestmentsScheduleOfMinimumFutureContractualRentToBeReceivedDetails</Role>
      <ShortName>Investments - Schedule of Minimum Future Contractual Rent to be Received (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>2408406 - Disclosure - Investments - Schedule of Loans Receivable, Net of Premium and Allowance for Loan Losses (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/InvestmentsScheduleOfLoansReceivableNetOfPremiumAndAllowanceForLoanLossesDetails</Role>
      <ShortName>Investments - Schedule of Loans Receivable, Net of Premium and Allowance for Loan Losses (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>2408407 - Disclosure - Investments - Schedule of Lease Intangible Assets and Liabilities, Net of Accumulated Amortization (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/InvestmentsScheduleOfLeaseIntangibleAssetsAndLiabilitiesNetOfAccumulatedAmortizationDetails</Role>
      <ShortName>Investments - Schedule of Lease Intangible Assets and Liabilities, Net of Accumulated Amortization (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>2408408 - Disclosure - Investments - Schedule of Components of Real Estate Investments Held Under Direct Financing Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/InvestmentsScheduleOfComponentsOfRealEstateInvestmentsHeldUnderDirectFinancingLeasesDetails</Role>
      <ShortName>Investments - Schedule of Components of Real Estate Investments Held Under Direct Financing Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>2408409 - Disclosure - Investments - Schedule of Activity in Real Estate Assets Held for Sale (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/InvestmentsScheduleOfActivityInRealEstateAssetsHeldForSaleDetails</Role>
      <ShortName>Investments - Schedule of Activity in Real Estate Assets Held for Sale (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>2408410 - Disclosure - Investments - Summary of Total Impairment Losses Recognized (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/InvestmentsSummaryOfTotalImpairmentLossesRecognizedDetails</Role>
      <ShortName>Investments - Summary of Total Impairment Losses Recognized (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>2411402 - Disclosure - Debt - Summary of Debt (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/DebtSummaryOfDebtDetails</Role>
      <ShortName>Debt - Summary of Debt (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>2411403 - Disclosure - Debt - Revolving Credit Facilities - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/DebtRevolvingCreditFacilitiesNarrativeDetails</Role>
      <ShortName>Debt - Revolving Credit Facilities - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>2411404 - Disclosure - Debt - Term Loan - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/DebtTermLoanNarrativeDetails</Role>
      <ShortName>Debt - Term Loan - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>2411405 - Disclosure - Debt - Senior Unsecured Notes - Narrative (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.spiritrealty.com/role/DebtSeniorUnsecuredNotesNarrativeDetails</Role>
      <ShortName>Debt - Senior Unsecured Notes - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>2411406 - Disclosure - Debt - Master Trust Notes - Narrative (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.spiritrealty.com/role/DebtMasterTrustNotesNarrativeDetails</Role>
      <ShortName>Debt - Master Trust Notes - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>2411407 - Disclosure - Debt - Summary of Debt - Master Trust Notes (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.spiritrealty.com/role/DebtSummaryOfDebtMasterTrustNotesDetails</Role>
      <ShortName>Debt - Summary of Debt - Master Trust Notes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>2411408 - Disclosure - Debt - CMBS - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/DebtCmbsNarrativeDetails</Role>
      <ShortName>Debt - CMBS - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>2411409 - Disclosure - Debt - Related Party Mortgage Loans Payable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/DebtRelatedPartyMortgageLoansPayableDetails</Role>
      <ShortName>Debt - Related Party Mortgage Loans Payable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>2411410 - Disclosure - Debt - Convertible Notes - Narrative (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.spiritrealty.com/role/DebtConvertibleNotesNarrativeDetails</Role>
      <ShortName>Debt - Convertible Notes - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>2411411 - Disclosure - Debt - Debt Extinguishment - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/DebtDebtExtinguishmentNarrativeDetails</Role>
      <ShortName>Debt - Debt Extinguishment - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>2411412 - Disclosure - Debt - Schedule of Debt Maturities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/DebtScheduleOfDebtMaturitiesDetails</Role>
      <ShortName>Debt - Schedule of Debt Maturities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>2411413 - Disclosure - Debt - Schedule of Debt Maturities (Footnote) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/DebtScheduleOfDebtMaturitiesFootnoteDetails</Role>
      <ShortName>Debt - Schedule of Debt Maturities (Footnote) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>2411414 - Disclosure - Debt - Summary of Components of Interest Expense Related to Borrowings (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/DebtSummaryOfComponentsOfInterestExpenseRelatedToBorrowingsDetails</Role>
      <ShortName>Debt - Summary of Components of Interest Expense Related to Borrowings (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>2413402 - Disclosure - Stockholders' Equity and Partners' Capital - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/StockholdersEquityAndPartnersCapitalNarrativeDetails</Role>
      <ShortName>Stockholders' Equity and Partners' Capital - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>2413403 - Disclosure - Stockholders' Equity and Partners' Capital - Summary of Dividends Declared (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/StockholdersEquityAndPartnersCapitalSummaryOfDividendsDeclaredDetails</Role>
      <ShortName>Stockholders' Equity and Partners' Capital - Summary of Dividends Declared (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>2416401 - Disclosure - Commitments and Contingencies - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/CommitmentsAndContingenciesNarrativeDetails</Role>
      <ShortName>Commitments and Contingencies - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>2417402 - Disclosure - Fair Value Measurements - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/FairValueMeasurementsNarrativeDetails</Role>
      <ShortName>Fair Value Measurements - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>2417403 - Disclosure - Fair Value Measurements - Schedule of Assets at Fair Value on Nonrecurring Basis (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/FairValueMeasurementsScheduleOfAssetsAtFairValueOnNonrecurringBasisDetails</Role>
      <ShortName>Fair Value Measurements - Schedule of Assets at Fair Value on Nonrecurring Basis (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>2417404 - Disclosure - Fair Value Measurements - Fair Value Inputs of Long-Lived Assets Held and Used and Held for Sale (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/FairValueMeasurementsFairValueInputsOfLongLivedAssetsHeldAndUsedAndHeldForSaleDetails</Role>
      <ShortName>Fair Value Measurements - Fair Value Inputs of Long-Lived Assets Held and Used and Held for Sale (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>2417405 - Disclosure - Fair Value Measurements - Schedule of Carrying Amount And Estimated Fair Value Of Financial Instruments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/FairValueMeasurementsScheduleOfCarryingAmountAndEstimatedFairValueOfFinancialInstrumentsDetails</Role>
      <ShortName>Fair Value Measurements - Schedule of Carrying Amount And Estimated Fair Value Of Financial Instruments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>59</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>2421402 - Disclosure - Discontinued Operations - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/DiscontinuedOperationsNarrativeDetails</Role>
      <ShortName>Discontinued Operations - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>2421403 - Disclosure - Discontinued Operations - Discontinued Operation, Balance Sheet Disclosures (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/DiscontinuedOperationsDiscontinuedOperationBalanceSheetDisclosuresDetails</Role>
      <ShortName>Discontinued Operations - Discontinued Operation, Balance Sheet Disclosures (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>2421404 - Disclosure - Discontinued Operations - Discontinued Operation, Statements of Operations Disclosures (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/DiscontinuedOperationsDiscontinuedOperationStatementsOfOperationsDisclosuresDetails</Role>
      <ShortName>Discontinued Operations - Discontinued Operation, Statements of Operations Disclosures (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>2421405 - Disclosure - Discontinued Operations - Discontinued Operation, Statements of Cash Flows Disclosures (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/DiscontinuedOperationsDiscontinuedOperationStatementsOfCashFlowsDisclosuresDetails</Role>
      <ShortName>Discontinued Operations - Discontinued Operation, Statements of Cash Flows Disclosures (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>2423401 - Disclosure - Incentive Award Plan - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/IncentiveAwardPlanNarrativeDetails</Role>
      <ShortName>Incentive Award Plan - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>2426402 - Disclosure - Income Per Share and Partnership Unit - Schedule of Reconciliation of the Numerator and Denominator Used in the Computation of Basic and Diluted Income Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/IncomePerShareAndPartnershipUnitScheduleOfReconciliationOfNumeratorAndDenominatorUsedInComputationOfBasicAndDilutedIncomePerShareDetails</Role>
      <ShortName>Income Per Share and Partnership Unit - Schedule of Reconciliation of the Numerator and Denominator Used in the Computation of Basic and Diluted Income Per Share (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>2426403 - Disclosure - Income Per Share and Partnership Unit - Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/IncomePerShareAndPartnershipUnitNarrativeDetails</Role>
      <ShortName>Income Per Share and Partnership Unit - Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>2428404 - Disclosure - Related Party Transactions and Arrangements - Related Party Agreements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/RelatedPartyTransactionsAndArrangementsRelatedPartyAgreementsDetails</Role>
      <ShortName>Related Party Transactions and Arrangements - Related Party Agreements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>2428405 - Disclosure - Related Party Transactions and Arrangements - Asset Management Agreement (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/RelatedPartyTransactionsAndArrangementsAssetManagementAgreementDetails</Role>
      <ShortName>Related Party Transactions and Arrangements - Asset Management Agreement (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>68</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>2428406 - Disclosure - Related Party Transactions and Arrangements - Management and Servicing Agreement (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/RelatedPartyTransactionsAndArrangementsManagementAndServicingAgreementDetails</Role>
      <ShortName>Related Party Transactions and Arrangements - Management and Servicing Agreement (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>2428407 - Disclosure - Related Party Transactions and Arrangements - Investments in SMTA (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/RelatedPartyTransactionsAndArrangementsInvestmentsInSmtaDetails</Role>
      <ShortName>Related Party Transactions and Arrangements - Investments in SMTA (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>2428408 - Disclosure - Related Party Transactions and Arrangements - Mortgage Loans Payable (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/RelatedPartyTransactionsAndArrangementsMortgageLoansPayableDetails</Role>
      <ShortName>Related Party Transactions and Arrangements - Mortgage Loans Payable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>2428409 - Disclosure - Related Party Transactions and Arrangements - Notes Receivable (Details)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.spiritrealty.com/role/RelatedPartyTransactionsAndArrangementsNotesReceivableDetails</Role>
      <ShortName>Related Party Transactions and Arrangements - Notes Receivable (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="src-20180630.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>2429401 - Disclosure - Subsequent Events - (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.spiritrealty.com/role/SubsequentEventsDetails</Role>
      <ShortName>Subsequent Events - (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.spiritrealty.com/role/SubsequentEvents</ParentRole>
      <Position>73</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>src-20180630.xml</File>
    <File>src-20180630.xsd</File>
    <File>src-20180630_cal.xml</File>
    <File>src-20180630_def.xml</File>
    <File>src-20180630_lab.xml</File>
    <File>src-20180630_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2014-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://fasb.org/us-gaap/2017-01-31</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/invest/2013-01-31</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
