<?xml version='1.0' encoding='UTF-8'?>
<FilingSummary>
  <Version>3.3.1.900</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>386</ContextCount>
  <ElementCount>477</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>139</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>11</UnitCount>
  <MyReports>
    <Report instance="sxcl-20151231.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.steelexcel.com/role/DocumentAndEntityInformation</Role>
      <ShortName>Document And Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>1001000 - Statement - Consolidated Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/ConsolidatedStatementsOfOperations</Role>
      <ShortName>Consolidated Statements of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>1002000 - Statement - Consolidated Statements of Comprehensive Income (Loss)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/ConsolidatedStatementsOfComprehensiveIncomeLoss</Role>
      <ShortName>Consolidated Statements of Comprehensive Income (Loss)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>1003000 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/ConsolidatedBalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>1003501 - Statement - Condensed Balance Sheets (Parentheticals)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/CondensedBalanceSheetsParentheticals</Role>
      <ShortName>Condensed Balance Sheets (Parentheticals)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>1004000 - Statement - Consolidated Statements of Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/ConsolidatedStatementsOfStockholdersEquity</Role>
      <ShortName>Consolidated Statements of Stockholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report instance="sxcl-20151231.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.steelexcel.com/role/ConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>2102100 - Disclosure - Organization and Basis of Presentation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/OrganizationAndBasisOfPresentation</Role>
      <ShortName>Organization and Basis of Presentation</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>2103100 - Disclosure - Summary of Significant Accounting Policies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/SummaryOfSignificantAccountingPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>2104100 - Disclosure - Revised Financial Statements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/RevisedFinancialStatements</Role>
      <ShortName>Revised Financial Statements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>2105100 - Disclosure - Acquisitions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/Acquisitions</Role>
      <ShortName>Acquisitions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>2106100 - Disclosure - Discontinued Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/DiscontinuedOperations</Role>
      <ShortName>Discontinued Operations</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>2107100 - Disclosure - Investments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/Investments</Role>
      <ShortName>Investments</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>2108100 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/FairValueMeasurements</Role>
      <ShortName>Fair Value Measurements</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>2109100 - Disclosure - Property and Equipment, Net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/PropertyAndEquipmentNet</Role>
      <ShortName>Property and Equipment, Net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>2110100 - Disclosure - Goodwill and Other Intangible Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/GoodwillAndOtherIntangibleAssets</Role>
      <ShortName>Goodwill and Other Intangible Assets</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>2111100 - Disclosure - Long-term Debt</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/LongTermDebt</Role>
      <ShortName>Long-term Debt</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>2112100 - Disclosure - Leases</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/Leases</Role>
      <ShortName>Leases</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>2114100 - Disclosure - Other Liabilities</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/OtherLiabilities</Role>
      <ShortName>Other Liabilities</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>2115100 - Disclosure - Other Income (Expense), net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/OtherIncomeExpenseNet</Role>
      <ShortName>Other Income (Expense), net</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>2116100 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>2117100 - Disclosure - Stock Benefit Plans</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/StockBenefitPlans</Role>
      <ShortName>Stock Benefit Plans</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>2118100 - Disclosure - Net Income (Loss) Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/NetIncomeLossPerShare</Role>
      <ShortName>Net Income (Loss) Per Share</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>23</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>2119100 - Disclosure - Accumulated Other Comprehensive Income (Loss)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/AccumulatedOtherComprehensiveIncomeLoss</Role>
      <ShortName>Accumulated Other Comprehensive Income (Loss)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>24</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>2120100 - Disclosure - Supplemental Cash Flow Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/SupplementalCashFlowInformation</Role>
      <ShortName>Supplemental Cash Flow Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>25</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>2121100 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/CommitmentsAndContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>26</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>2122100 - Disclosure - Related Party Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/RelatedPartyTransactions</Role>
      <ShortName>Related Party Transactions</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>27</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>2123100 - Disclosure - Segment Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/SegmentInformation</Role>
      <ShortName>Segment Information</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>28</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>2124100 - Disclosure - Stock Split</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/StockSplit</Role>
      <ShortName>Stock Split</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>29</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>2125100 - Disclosure - Subsequent Event</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/SubsequentEvent</Role>
      <ShortName>Subsequent Event</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>30</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>2126100 - Disclosure - Selected Quarterly Financial Data (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/SelectedQuarterlyFinancialDataUnaudited</Role>
      <ShortName>Selected Quarterly Financial Data (Unaudited)</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>2127100 - Disclosure - Schedule II - Valuation and Qualifying Accounts</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/ScheduleIiValuationAndQualifyingAccounts</Role>
      <ShortName>Schedule II - Valuation and Qualifying Accounts</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>2203201 - Disclosure - Summary of Significant Accounting Policies (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/SummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/SummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>33</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>2304301 - Disclosure - Revised Financial Statements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/RevisedFinancialStatementsTables</Role>
      <ShortName>Revised Financial Statements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/RevisedFinancialStatements</ParentRole>
      <Position>34</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>2305301 - Disclosure - Acquisitions (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/AcquisitionsTables</Role>
      <ShortName>Acquisitions (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/Acquisitions</ParentRole>
      <Position>35</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>2306301 - Disclosure - Discontinued Operations (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/DiscontinuedOperationsTables</Role>
      <ShortName>Discontinued Operations (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/DiscontinuedOperations</ParentRole>
      <Position>36</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>2307301 - Disclosure - Investments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/InvestmentsTables</Role>
      <ShortName>Investments (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/Investments</ParentRole>
      <Position>37</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>2308301 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/FairValueMeasurementsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/FairValueMeasurements</ParentRole>
      <Position>38</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>2309301 - Disclosure - Property and Equipment, Net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/PropertyAndEquipmentNetTables</Role>
      <ShortName>Property and Equipment, Net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/PropertyAndEquipmentNet</ParentRole>
      <Position>39</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>2310301 - Disclosure - Goodwill and Other Intangible Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/GoodwillAndOtherIntangibleAssetsTables</Role>
      <ShortName>Goodwill and Other Intangible Assets (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/GoodwillAndOtherIntangibleAssets</ParentRole>
      <Position>40</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>2311301 - Disclosure - Long-term Debt (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/LongTermDebtTables</Role>
      <ShortName>Long-term Debt (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/LongTermDebt</ParentRole>
      <Position>41</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>2312301 - Disclosure - Leases (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/LeasesTables</Role>
      <ShortName>Leases (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/Leases</ParentRole>
      <Position>42</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>2314301 - Disclosure - Other Liabilities (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/OtherLiabilitiesTables</Role>
      <ShortName>Other Liabilities (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/OtherLiabilities</ParentRole>
      <Position>43</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>2315301 - Disclosure - Other Income (Expense), net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/OtherIncomeExpenseNetTables</Role>
      <ShortName>Other Income (Expense), net (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/OtherIncomeExpenseNet</ParentRole>
      <Position>44</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>2316301 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/IncomeTaxesTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/IncomeTaxes</ParentRole>
      <Position>45</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>2317301 - Disclosure - Stock Benefit Plans (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/StockBenefitPlansTables</Role>
      <ShortName>Stock Benefit Plans (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/StockBenefitPlans</ParentRole>
      <Position>46</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>2318301 - Disclosure - Net Income (Loss) Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/NetIncomeLossPerShareTables</Role>
      <ShortName>Net Income (Loss) Per Share (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/NetIncomeLossPerShare</ParentRole>
      <Position>47</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>2319301 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/AccumulatedOtherComprehensiveIncomeLossTables</Role>
      <ShortName>Accumulated Other Comprehensive Income (Loss) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/AccumulatedOtherComprehensiveIncomeLoss</ParentRole>
      <Position>48</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>2320301 - Disclosure - Supplemental Cash Flows Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/SupplementalCashFlowsInformationTables</Role>
      <ShortName>Supplemental Cash Flows Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>2323301 - Disclosure - Segment Information (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/SegmentInformationTables</Role>
      <ShortName>Segment Information (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/SegmentInformation</ParentRole>
      <Position>50</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>2326301 - Disclosure - Selected Quarterly Financial Data (Unaudited) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/SelectedQuarterlyFinancialDataUnauditedTables</Role>
      <ShortName>Selected Quarterly Financial Data (Unaudited) (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/SelectedQuarterlyFinancialDataUnaudited</ParentRole>
      <Position>51</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>2402401 - Disclosure - Organization and Basis of Presentation (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/OrganizationAndBasisOfPresentationDetail</Role>
      <ShortName>Organization and Basis of Presentation (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/OrganizationAndBasisOfPresentation</ParentRole>
      <Position>52</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>2403402 - Disclosure - Summary of Significant Accounting Policies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/SummaryOfSignificantAccountingPoliciesDetails</Role>
      <ShortName>Summary of Significant Accounting Policies (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/SummaryOfSignificantAccountingPoliciesPolicies</ParentRole>
      <Position>53</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>2404402 - Disclosure - Revised Financial Statements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/RevisedFinancialStatementsDetails</Role>
      <ShortName>Revised Financial Statements (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/RevisedFinancialStatementsTables</ParentRole>
      <Position>54</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>2405402 - Disclosure - Acquisitions Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/AcquisitionsNarrativeDetails</Role>
      <ShortName>Acquisitions Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>2405404 - Disclosure - Acquisitions Pro Forma Information (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/AcquisitionsProFormaInformationDetails</Role>
      <ShortName>Acquisitions Pro Forma Information (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>56</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>2406402 - Disclosure - Discontinued Operations Revenues and Components of Income Related to Discontinued Operations (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/DiscontinuedOperationsRevenuesAndComponentsOfIncomeRelatedToDiscontinuedOperationsDetail</Role>
      <ShortName>Discontinued Operations Revenues and Components of Income Related to Discontinued Operations (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>57</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>2406403 - Disclosure - Discontinued Operations Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/DiscontinuedOperationsNarrativeDetails</Role>
      <ShortName>Discontinued Operations Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>58</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>2407402 - Disclosure - Investments (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/InvestmentsDetail</Role>
      <ShortName>Investments (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/InvestmentsTables</ParentRole>
      <Position>59</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>2407403 - Disclosure - Investments Portfolio of Marketable Securities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/InvestmentsPortfolioOfMarketableSecuritiesDetail</Role>
      <ShortName>Investments Portfolio of Marketable Securities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>60</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>2407404 - Disclosure - Investments Fair Value and Gross Unrealized Losses of Available for Sale Securities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/InvestmentsFairValueAndGrossUnrealizedLossesOfAvailableForSaleSecuritiesDetail</Role>
      <ShortName>Investments Fair Value and Gross Unrealized Losses of Available for Sale Securities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>61</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>2407405 - Disclosure - Investments Amortized Cost and Estimated Fair Value of Investments in Available-for-sale Securities, by Contractual Maturity (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/InvestmentsAmortizedCostAndEstimatedFairValueOfInvestmentsInAvailableForSaleSecuritiesByContractualMaturityDetails</Role>
      <ShortName>Investments Amortized Cost and Estimated Fair Value of Investments in Available-for-sale Securities, by Contractual Maturity (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>62</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>2407406 - Disclosure - Investments Financial Instrument Obligations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/InvestmentsFinancialInstrumentObligationsDetails</Role>
      <ShortName>Investments Financial Instrument Obligations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>63</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>2407407 - Disclosure - Investments Equity Method Investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/InvestmentsEquityMethodInvestmentsDetails</Role>
      <ShortName>Investments Equity Method Investments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>64</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>2407408 - Disclosure - Investments Financial Results (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/InvestmentsFinancialResultsDetails</Role>
      <ShortName>Investments Financial Results (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>65</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>2408403 - Disclosure - Fair Value Measurements Financial assets measured at fair value on a recurring basis (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/FairValueMeasurementsFinancialAssetsMeasuredAtFairValueOnRecurringBasisDetail</Role>
      <ShortName>Fair Value Measurements Financial assets measured at fair value on a recurring basis (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>66</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>2408404 - Disclosure - Fair Value Measurements Reconciliation of the beginning and ending balances of the Level 3 assets and liabilities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/FairValueMeasurementsReconciliationOfBeginningAndEndingBalancesOfLevel3AssetsAndLiabilitiesDetail</Role>
      <ShortName>Fair Value Measurements Reconciliation of the beginning and ending balances of the Level 3 assets and liabilities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>67</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>2409402 - Disclosure - Property and Equipment, Net (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/PropertyAndEquipmentNetDetail</Role>
      <ShortName>Property and Equipment, Net (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/PropertyAndEquipmentNetTables</ParentRole>
      <Position>68</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>2409403 - Disclosure - Property and Equipment, Net Schedule of Property and Equipment (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/PropertyAndEquipmentNetScheduleOfPropertyAndEquipmentDetail</Role>
      <ShortName>Property and Equipment, Net Schedule of Property and Equipment (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>69</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>2410402 - Disclosure - Goodwill and Other Intangible Assets Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/GoodwillAndOtherIntangibleAssetsNarrativeDetails</Role>
      <ShortName>Goodwill and Other Intangible Assets Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>70</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>2410403 - Disclosure - Goodwill and Other Intangible Assets Intangible Assets, Net (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/GoodwillAndOtherIntangibleAssetsIntangibleAssetsNetDetail</Role>
      <ShortName>Goodwill and Other Intangible Assets Intangible Assets, Net (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>71</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>2410404 - Disclosure - Goodwill and Other Intangible Assets Estimated Aggregate Future Amortization Expense (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/GoodwillAndOtherIntangibleAssetsEstimatedAggregateFutureAmortizationExpenseDetails</Role>
      <ShortName>Goodwill and Other Intangible Assets Estimated Aggregate Future Amortization Expense (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>72</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>2410405 - Disclosure - Goodwill and Other Intangible Assets Goodwill Reconciliation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/GoodwillAndOtherIntangibleAssetsGoodwillReconciliationDetails</Role>
      <ShortName>Goodwill and Other Intangible Assets Goodwill Reconciliation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>73</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>2410406 - Disclosure - Goodwill and Other Intangible Assets Components of Goodwill (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/GoodwillAndOtherIntangibleAssetsComponentsOfGoodwillDetails</Role>
      <ShortName>Goodwill and Other Intangible Assets Components of Goodwill (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>74</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>2411402 - Disclosure - Long-term Debt Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/LongTermDebtNarrativeDetails</Role>
      <ShortName>Long-term Debt Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>75</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>2411403 - Disclosure - Long-term Debt Assets Pledged As Collateral (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/LongTermDebtAssetsPledgedAsCollateralDetails</Role>
      <ShortName>Long-term Debt Assets Pledged As Collateral (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>76</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R77.htm</HtmlFileName>
      <LongName>2411404 - Disclosure - Long-term Debt Principal payments under the Energy Credit Agreement (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/LongTermDebtPrincipalPaymentsUnderEnergyCreditAgreementDetails</Role>
      <ShortName>Long-term Debt Principal payments under the Energy Credit Agreement (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>77</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R78.htm</HtmlFileName>
      <LongName>2412402 - Disclosure - Leases Future Minimum Rental Payments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/LeasesFutureMinimumRentalPaymentsDetails</Role>
      <ShortName>Leases Future Minimum Rental Payments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>78</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R79.htm</HtmlFileName>
      <LongName>2412403 - Disclosure - Leases Asset Recorded under Capital Leases (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/LeasesAssetRecordedUnderCapitalLeasesDetails</Role>
      <ShortName>Leases Asset Recorded under Capital Leases (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>79</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>2414402 - Disclosure - Other Liabilities Accrued and other liabilities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/OtherLiabilitiesAccruedAndOtherLiabilitiesDetail</Role>
      <ShortName>Other Liabilities Accrued and other liabilities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>80</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>2414403 - Disclosure - Other Liabilities Other long-term liabilities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/OtherLiabilitiesOtherLongTermLiabilitiesDetail</Role>
      <ShortName>Other Liabilities Other long-term liabilities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>81</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>2415402 - Disclosure - Other Income (Expense), net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/OtherIncomeExpenseNetDetails</Role>
      <ShortName>Other Income (Expense), net (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/OtherIncomeExpenseNetTables</ParentRole>
      <Position>82</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>2416402 - Disclosure - Income Taxes Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/IncomeTaxesNarrativeDetails</Role>
      <ShortName>Income Taxes Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>83</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R84.htm</HtmlFileName>
      <LongName>2416403 - Disclosure - Income Taxes Components of Income Tax Benefit (Provision) from Continuing Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/IncomeTaxesComponentsOfIncomeTaxBenefitProvisionFromContinuingOperationsDetails</Role>
      <ShortName>Income Taxes Components of Income Tax Benefit (Provision) from Continuing Operations (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>84</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>2416404 - Disclosure - Income Taxes Components of Income (Loss) from Continuing Operations before Benefit from (Provision for) Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/IncomeTaxesComponentsOfIncomeLossFromContinuingOperationsBeforeBenefitFromProvisionForIncomeTaxesDetails</Role>
      <ShortName>Income Taxes Components of Income (Loss) from Continuing Operations before Benefit from (Provision for) Income Taxes (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>85</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R86.htm</HtmlFileName>
      <LongName>2416405 - Disclosure - Income Taxes Effective Tax Rate Reconciliation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/IncomeTaxesEffectiveTaxRateReconciliationDetails</Role>
      <ShortName>Income Taxes Effective Tax Rate Reconciliation (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>86</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R87.htm</HtmlFileName>
      <LongName>2416406 - Disclosure - Income Taxes Components of Deferred Tax Assets and Liabilities (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/IncomeTaxesComponentsOfDeferredTaxAssetsAndLiabilitiesDetails</Role>
      <ShortName>Income Taxes Components of Deferred Tax Assets and Liabilities (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>87</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R88.htm</HtmlFileName>
      <LongName>2416408 - Disclosure - Income Taxes Unrecognized Tax Benefits Roll Forward (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/IncomeTaxesUnrecognizedTaxBenefitsRollForwardDetails</Role>
      <ShortName>Income Taxes Unrecognized Tax Benefits Roll Forward (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>88</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R89.htm</HtmlFileName>
      <LongName>2417402 - Disclosure - Stock Benefit Plans Narrative (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/StockBenefitPlansNarrativeDetails</Role>
      <ShortName>Stock Benefit Plans Narrative (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>89</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R90.htm</HtmlFileName>
      <LongName>2417404 - Disclosure - Stock Benefit Plans Stock-based Compensation Expense by Type of Equity Award (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/StockBenefitPlansStockBasedCompensationExpenseByTypeOfEquityAwardDetails</Role>
      <ShortName>Stock Benefit Plans Stock-based Compensation Expense by Type of Equity Award (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>90</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R91.htm</HtmlFileName>
      <LongName>2417405 - Disclosure - Stock Benefit Plans Stock Options Roll Forward (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/StockBenefitPlansStockOptionsRollForwardDetails</Role>
      <ShortName>Stock Benefit Plans Stock Options Roll Forward (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>91</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R92.htm</HtmlFileName>
      <LongName>2417406 - Disclosure - Stock Benefit Plans Restricted Stock Roll Forward (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/StockBenefitPlansRestrictedStockRollForwardDetails</Role>
      <ShortName>Stock Benefit Plans Restricted Stock Roll Forward (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>92</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R93.htm</HtmlFileName>
      <LongName>2417407 - Disclosure - Stock Benefit Plans Information Relating to Fair Value of Grants of Equity Awards and the Fair Value of Options Exercised and Restricted Shares Vested (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/StockBenefitPlansInformationRelatingToFairValueOfGrantsOfEquityAwardsAndFairValueOfOptionsExercisedAndRestrictedSharesVestedDetails</Role>
      <ShortName>Stock Benefit Plans Information Relating to Fair Value of Grants of Equity Awards and the Fair Value of Options Exercised and Restricted Shares Vested (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>93</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R94.htm</HtmlFileName>
      <LongName>2418402 - Disclosure - Net Income (Loss) Per Share Reconciliation of Numerator and Denominator of Basic and Diluted Net (Loss) Income Per Share (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/NetIncomeLossPerShareReconciliationOfNumeratorAndDenominatorOfBasicAndDilutedNetLossIncomePerShareDetail</Role>
      <ShortName>Net Income (Loss) Per Share Reconciliation of Numerator and Denominator of Basic and Diluted Net (Loss) Income Per Share (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/NetIncomeLossPerShareTables</ParentRole>
      <Position>94</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R95.htm</HtmlFileName>
      <LongName>2419402 - Disclosure - Accumulated Other Comprehensive Income (Loss) - Changes, net of tax, in Accumulated Other Comprehensive income (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/AccumulatedOtherComprehensiveIncomeLossChangesNetOfTaxInAccumulatedOtherComprehensiveIncomeDetail</Role>
      <ShortName>Accumulated Other Comprehensive Income (Loss) - Changes, net of tax, in Accumulated Other Comprehensive income (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/AccumulatedOtherComprehensiveIncomeLossTables</ParentRole>
      <Position>95</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R96.htm</HtmlFileName>
      <LongName>2420402 - Disclosure - Supplemental Cash Flow Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/SupplementalCashFlowInformationDetail</Role>
      <ShortName>Supplemental Cash Flow Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/SupplementalCashFlowInformation</ParentRole>
      <Position>96</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R97.htm</HtmlFileName>
      <LongName>2422401 - Disclosure - Related Party Transactions (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/RelatedPartyTransactionsDetail</Role>
      <ShortName>Related Party Transactions (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/RelatedPartyTransactions</ParentRole>
      <Position>97</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R98.htm</HtmlFileName>
      <LongName>2423402 - Disclosure - Segment Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/SegmentInformationDetail</Role>
      <ShortName>Segment Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/SegmentInformationTables</ParentRole>
      <Position>98</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R99.htm</HtmlFileName>
      <LongName>2423403 - Disclosure - Segment Information Operating Results (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/SegmentInformationOperatingResultsDetail</Role>
      <ShortName>Segment Information Operating Results (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>99</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R100.htm</HtmlFileName>
      <LongName>2423404 - Disclosure - Segment Information Revenue by Major Customers, by Reporting Segments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/SegmentInformationRevenueByMajorCustomersByReportingSegmentsDetails</Role>
      <ShortName>Segment Information Revenue by Major Customers, by Reporting Segments (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>100</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R101.htm</HtmlFileName>
      <LongName>2423405 - Disclosure - Segment Information Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/SegmentInformationAssetsDetail</Role>
      <ShortName>Segment Information Assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>101</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R102.htm</HtmlFileName>
      <LongName>2424401 - Disclosure - Stock Split (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/StockSplitDetails</Role>
      <ShortName>Stock Split (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/StockSplit</ParentRole>
      <Position>102</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R103.htm</HtmlFileName>
      <LongName>2426402 - Disclosure - Selected Quarterly Financial Data (Unaudited) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/SelectedQuarterlyFinancialDataUnauditedDetails</Role>
      <ShortName>Selected Quarterly Financial Data (Unaudited) (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/SelectedQuarterlyFinancialDataUnauditedTables</ParentRole>
      <Position>103</Position>
    </Report>
    <Report instance="sxcl-20151231.xml">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R104.htm</HtmlFileName>
      <LongName>2427401 - Disclosure - Schedule II - Valuation and Qualifying Accounts (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.steelexcel.com/role/ScheduleIiValuationAndQualifyingAccountsDetails</Role>
      <ShortName>Schedule II - Valuation and Qualifying Accounts (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <ParentRole>http://www.steelexcel.com/role/ScheduleIiValuationAndQualifyingAccounts</ParentRole>
      <Position>104</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File>sxcl-20151231.xml</File>
    <File>sxcl-20151231.xsd</File>
    <File>sxcl-20151231_cal.xml</File>
    <File>sxcl-20151231_def.xml</File>
    <File>sxcl-20151231_lab.xml</File>
    <File>sxcl-20151231_pre.xml</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies/>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
