<?xml version='1.0' encoding='UTF-8'?>
<FilingSummary>
  <Version>3.2.0.727</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>207</ContextCount>
  <ElementCount>270</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>82</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>4</UnitCount>
  <MyReports>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>101 - Document - Document And Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/DocumentAndEntityInformation</Role>
      <ShortName>Document And Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>102 - Statement - Condensed Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/CondensedConsolidatedBalanceSheets</Role>
      <ShortName>Condensed Consolidated Balance Sheets</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>103 - Statement - Condensed Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/CondensedConsolidatedBalanceSheetsParenthetical</Role>
      <ShortName>Condensed Consolidated Balance Sheets (Parenthetical)</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>104 - Statement - Condensed Consolidated Statements of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/CondensedConsolidatedStatementsOfOperations</Role>
      <ShortName>Condensed Consolidated Statements of Operations</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>4</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>105 - Statement - Condensed Consolidated Statements of Comprehensive Income and Loss</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/CondensedConsolidatedStatementsOfComprehensiveIncomeAndLoss</Role>
      <ShortName>Condensed Consolidated Statements of Comprehensive Income and Loss</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>5</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>106 - Statement - Condensed Consolidated Statements of Changes in Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/CondensedConsolidatedStatementsOfChangesInStockholdersEquity</Role>
      <ShortName>Condensed Consolidated Statements of Changes in Stockholders' Equity</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>6</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>107 - Statement - Condensed Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/CondensedConsolidatedStatementsOfCashFlows</Role>
      <ShortName>Condensed Consolidated Statements of Cash Flows</ShortName>
      <MenuCategory>Statements</MenuCategory>
      <Position>7</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>108 - Disclosure - NATURE OF OPERATIONS AND BASIS OF PRESENTATION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/NatureOfOperationsAndBasisOfPresentation</Role>
      <ShortName>NATURE OF OPERATIONS AND BASIS OF PRESENTATION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>8</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>109 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/SummaryOfSignificantAccountingPolicies</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>9</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>110 - Disclosure - INVESTMENTS AND FAIR VALUE MEASUREMENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/InvestmentsAndFairValueMeasurements</Role>
      <ShortName>INVESTMENTS AND FAIR VALUE MEASUREMENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>10</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>111 - Disclosure - ACQUISITION</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/Acquisition</Role>
      <ShortName>ACQUISITION</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>11</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>112 - Disclosure - INCOME (LOSS) PER COMMON SHARE</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/IncomeLossPerCommonShare</Role>
      <ShortName>INCOME (LOSS) PER COMMON SHARE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>12</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>113 - Disclosure - CAPITALIZED INTEREST</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/CapitalizedInterest</Role>
      <ShortName>CAPITALIZED INTEREST</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>13</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>114 - Disclosure - INCOME TAXES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/IncomeTaxes</Role>
      <ShortName>INCOME TAXES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>14</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>115 - Disclosure - WORKING CAPITAL LINE OF CREDIT</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/WorkingCapitalLineOfCredit</Role>
      <ShortName>WORKING CAPITAL LINE OF CREDIT</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>15</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>116 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/AccumulatedOtherComprehensiveIncome</Role>
      <ShortName>ACCUMULATED OTHER COMPREHENSIVE INCOME</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>16</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>117 - Disclosure - CAPITAL LEASES</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/CapitalLeases</Role>
      <ShortName>CAPITAL LEASES</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>17</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>118 - Disclosure - NOTES PAYABLE</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.cuiglobal.com/role/NotesPayable</Role>
      <ShortName>NOTES PAYABLE</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>18</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>119 - Disclosure - CONCENTRATIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/Concentrations</Role>
      <ShortName>CONCENTRATIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>19</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>120 - Disclosure - OTHER EQUITY TRANSACTIONS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/OtherEquityTransactions</Role>
      <ShortName>OTHER EQUITY TRANSACTIONS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>20</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>121 - Disclosure - SUBSEQUENT EVENTS</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/SubsequentEvents</Role>
      <ShortName>SUBSEQUENT EVENTS</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>21</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>122 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/SummaryOfSignificantAccountingPoliciesPolicies</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</ShortName>
      <MenuCategory>Policies</MenuCategory>
      <Position>22</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>123 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/SummaryOfSignificantAccountingPoliciesTables</Role>
      <ShortName>SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.cuiglobal.com/role/SummaryOfSignificantAccountingPolicies</ParentRole>
      <Position>23</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>124 - Disclosure - INVESTMENTS AND FAIR VALUE MEASUREMENTS (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/InvestmentsAndFairValueMeasurementsTables</Role>
      <ShortName>INVESTMENTS AND FAIR VALUE MEASUREMENTS (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.cuiglobal.com/role/InvestmentsAndFairValueMeasurements</ParentRole>
      <Position>24</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>125 - Disclosure - ACQUISITION (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/AcquisitionTables</Role>
      <ShortName>ACQUISITION (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.cuiglobal.com/role/Acquisition</ParentRole>
      <Position>25</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>126 - Disclosure - INCOME (LOSS) PER COMMON SHARE (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/IncomeLossPerCommonShareTables</Role>
      <ShortName>INCOME (LOSS) PER COMMON SHARE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.cuiglobal.com/role/IncomeLossPerCommonShare</ParentRole>
      <Position>26</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>127 - Disclosure - CAPITALIZED INTEREST (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/CapitalizedInterestTables</Role>
      <ShortName>CAPITALIZED INTEREST (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.cuiglobal.com/role/CapitalizedInterest</ParentRole>
      <Position>27</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>128 - Disclosure - ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/AccumulatedOtherComprehensiveIncomeTables</Role>
      <ShortName>ACCUMULATED OTHER COMPREHENSIVE INCOME (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.cuiglobal.com/role/AccumulatedOtherComprehensiveIncome</ParentRole>
      <Position>28</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>129 - Disclosure - CAPITAL LEASES (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/CapitalLeasesTables</Role>
      <ShortName>CAPITAL LEASES (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.cuiglobal.com/role/CapitalLeases</ParentRole>
      <Position>29</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>130 - Disclosure - NOTES PAYABLE (Tables)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.cuiglobal.com/role/NotesPayableTables</Role>
      <ShortName>NOTES PAYABLE (Tables)</ShortName>
      <MenuCategory>Tables</MenuCategory>
      <ParentRole>http://www.cuiglobal.com/role/NotesPayable</ParentRole>
      <Position>30</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>131 - Disclosure - Nature of Operations and Basis of Presentation - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/NatureOfOperationsAndBasisOfPresentationAdditionalInformationDetail</Role>
      <ShortName>Nature of Operations and Basis of Presentation - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>31</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>132 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetail</Role>
      <ShortName>Summary of Significant Accounting Policies - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>32</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>133 - Disclosure - Estimated Useful Lives and Accumulated Depreciation for Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/EstimatedUsefulLivesAndAccumulatedDepreciationForAssetsDetail</Role>
      <ShortName>Estimated Useful Lives and Accumulated Depreciation for Assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>33</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>134 - Disclosure - Estimated Useful Life for the Intangible Assets (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/EstimatedUsefulLifeForIntangibleAssetsDetail</Role>
      <ShortName>Estimated Useful Life for the Intangible Assets (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>34</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>135 - Disclosure - Summary of Financial Statements of Affiliate (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/SummaryOfFinancialStatementsOfAffiliateDetail</Role>
      <ShortName>Summary of Financial Statements of Affiliate (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>35</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>136 - Disclosure - Summary of Segment Activity (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/SummaryOfSegmentActivityDetail</Role>
      <ShortName>Summary of Segment Activity (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>36</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>137 - Disclosure - Revenue From External Customers By Geographic Areas (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/RevenueFromExternalCustomersByGeographicAreasDetail</Role>
      <ShortName>Revenue From External Customers By Geographic Areas (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>37</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>138 - Disclosure - Fair Value Hierarchy for Cash Equivalents and Marketable Securities (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/FairValueHierarchyForCashEquivalentsAndMarketableSecuritiesDetail</Role>
      <ShortName>Fair Value Hierarchy for Cash Equivalents and Marketable Securities (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>38</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>139 - Disclosure - Acquisition - Additional information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/AcquisitionAdditionalInformationDetail</Role>
      <ShortName>Acquisition - Additional information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>39</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>140 - Disclosure - Allocation of Purchase Price (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/AllocationOfPurchasePriceDetail</Role>
      <ShortName>Allocation of Purchase Price (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>40</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>141 - Disclosure - Summary of Unaudited Proforma Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/SummaryOfUnauditedProformaInformationDetail</Role>
      <ShortName>Summary of Unaudited Proforma Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>41</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>142 - Disclosure - Income (Loss) Per Common Share - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/IncomeLossPerCommonShareAdditionalInformationDetail</Role>
      <ShortName>Income (Loss) Per Common Share - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>42</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>143 - Disclosure - Income (Loss) Per Common Share (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/IncomeLossPerCommonShareDetail</Role>
      <ShortName>Income (Loss) Per Common Share (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>43</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>144 - Disclosure - Components of interest expense and capitalized interest (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/ComponentsOfInterestExpenseAndCapitalizedInterestDetails</Role>
      <ShortName>Components of interest expense and capitalized interest (Details)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>44</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>145 - Disclosure - Income Taxes - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/IncomeTaxesAdditionalInformationDetail</Role>
      <ShortName>Income Taxes - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>45</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>146 - Disclosure - Working Capital Line of Credit - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/WorkingCapitalLineOfCreditAdditionalInformationDetail</Role>
      <ShortName>Working Capital Line of Credit - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>46</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>147 - Disclosure - Accumulated Other Comprehensive Income (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/AccumulatedOtherComprehensiveIncomeDetail</Role>
      <ShortName>Accumulated Other Comprehensive Income (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>47</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>148 - Disclosure - Analysis of Leased Property Under Capital Leases (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/AnalysisOfLeasedPropertyUnderCapitalLeasesDetail</Role>
      <ShortName>Analysis of Leased Property Under Capital Leases (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>48</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>149 - Disclosure - Current and Long Term Portion of Capital Leases (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/CurrentAndLongTermPortionOfCapitalLeasesDetail</Role>
      <ShortName>Current and Long Term Portion of Capital Leases (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>49</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>150 - Disclosure - Notes Payable - Additional Information (Detail)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.cuiglobal.com/role/NotesPayableAdditionalInformationDetail</Role>
      <ShortName>Notes Payable - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>50</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>151 - Disclosure - Summary of Notes Payable (Detail)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.cuiglobal.com/role/SummaryOfNotesPayableDetail</Role>
      <ShortName>Summary of Notes Payable (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>51</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>152 - Disclosure - Maturity of Notes Payable (Detail)</LongName>
      <ReportType>Notes</ReportType>
      <Role>http://www.cuiglobal.com/role/MaturityOfNotesPayableDetail</Role>
      <ShortName>Maturity of Notes Payable (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>52</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>153 - Disclosure - Concentrations - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/ConcentrationsAdditionalInformationDetail</Role>
      <ShortName>Concentrations - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>53</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>154 - Disclosure - Other Equity Transactions - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/OtherEquityTransactionsAdditionalInformationDetail</Role>
      <ShortName>Other Equity Transactions - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>54</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>155 - Disclosure - Subsequent Events - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.cuiglobal.com/role/SubsequentEventsAdditionalInformationDetail</Role>
      <ShortName>Subsequent Events - Additional Information (Detail)</ShortName>
      <MenuCategory>Details</MenuCategory>
      <Position>55</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <Logs>
    <Log type="Info">In ''Condensed Consolidated Balance Sheets'', column(s) 3, 4 are contained in other reports, so were removed by flow through suppression.</Log>
    <Log type="Info">In ''Condensed Consolidated Balance Sheets (Parenthetical)'', column(s) 1 are contained in other reports, so were removed by flow through suppression.</Log>
    <Log type="Info">In ''Condensed Consolidated Statements of Comprehensive Income and Loss'', column(s) 5 are contained in other reports, so were removed by flow through suppression.</Log>
    <Log type="Info">In ''Condensed Consolidated Statements of Cash Flows'', column(s) 1, 2 are contained in other reports, so were removed by flow through suppression.</Log>
  </Logs>
  <InputFiles>
    <File>cui-20150630.xml</File>
    <File>cui-20150630_cal.xml</File>
    <File>cui-20150630_def.xml</File>
    <File>cui-20150630_lab.xml</File>
    <File>cui-20150630_pre.xml</File>
    <File>cui-20150630.xsd</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies/>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>

