<?xml version="1.0" encoding="utf-8"?>
<FilingSummary xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <Version>2.4.0.6</Version>
  <ProcessingTime />
  <ReportFormat>Html</ReportFormat>
  <ContextCount>300</ContextCount>
  <ElementCount>518</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>80</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>13</UnitCount>
  <MyReports>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>00 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/DocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
    </Report>
    <Report>
      <IsDefault>true</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>0110 - Statement - Consolidated Balance Sheets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/BalanceSheets</Role>
      <ShortName>Consolidated Balance Sheets</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>0111 - Statement - Consolidated Balance Sheets (Parenthetical)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/BalanceSheetsParenthetical</Role>
      <ShortName>Consolidated Balance Sheets (Parenthetical)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>0120 - Statement - Consolidated Statements of Comprehensive Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/StatementsOfComprehensiveOperations</Role>
      <ShortName>Consolidated Statements of Comprehensive Operations</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>0130 - Statement - Consolidated Statements of Stockholders' Equity</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/StatementsOfStockholdersEquity</Role>
      <ShortName>Consolidated Statements of Stockholders' Equity</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>0140 - Statement - Consolidated Statements of Cash Flows</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/StatementsOfCashFlows</Role>
      <ShortName>Consolidated Statements of Cash Flows</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R7.htm</HtmlFileName>
      <LongName>0201 - Disclosure - Summary of Significant Accounting Policies and Nature of Operations</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/SummaryOfSignificantAccountingPoliciesAndNatureOfOperations</Role>
      <ShortName>Summary of Significant Accounting Policies and Nature of Operations</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R8.htm</HtmlFileName>
      <LongName>0202 - Disclosure - Investments</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/Investments</Role>
      <ShortName>Investments</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R9.htm</HtmlFileName>
      <LongName>0203 - Disclosure - Fair Value Measurements</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/FairValueMeasurements</Role>
      <ShortName>Fair Value Measurements</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R10.htm</HtmlFileName>
      <LongName>0204 - Disclosure - Property and Equipment, Net</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/PropertyAndEquipmentNet</Role>
      <ShortName>Property and Equipment, Net</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R11.htm</HtmlFileName>
      <LongName>0205 - Disclosure - Business Combination</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/BusinessCombination</Role>
      <ShortName>Business Combination</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R12.htm</HtmlFileName>
      <LongName>0206 - Disclosure - Goodwill and Intangible Assets</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/GoodwillAndIntangibleAssets</Role>
      <ShortName>Goodwill and Intangible Assets</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R13.htm</HtmlFileName>
      <LongName>0207 - Disclosure - Borrowings</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/Borrowings</Role>
      <ShortName>Borrowings</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R14.htm</HtmlFileName>
      <LongName>0208 - Disclosure - Stockholders' Equity and Share-Based Compensation</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/StockholdersEquityAndShareBasedCompensation</Role>
      <ShortName>Stockholders' Equity and Share-Based Compensation</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R15.htm</HtmlFileName>
      <LongName>0209 - Disclosure - Net Loss Per Share</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/NetLossPerShare</Role>
      <ShortName>Net Loss Per Share</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R16.htm</HtmlFileName>
      <LongName>0210 - Disclosure - Income Taxes</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/IncomeTaxes</Role>
      <ShortName>Income Taxes</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R17.htm</HtmlFileName>
      <LongName>0211 - Disclosure - Commitments and Contingencies</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/CommitmentsAndContingencies</Role>
      <ShortName>Commitments and Contingencies</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R18.htm</HtmlFileName>
      <LongName>0212 - Disclosure - Employee Retirement Plan and Deferred Compensation Plan</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/EmployeeRetirementPlanAndDeferredCompensationPlan</Role>
      <ShortName>Employee Retirement Plan and Deferred Compensation Plan</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R19.htm</HtmlFileName>
      <LongName>0213 - Disclosure - Restructuring Costs</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/RestructuringCosts</Role>
      <ShortName>Restructuring Costs</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R20.htm</HtmlFileName>
      <LongName>0214 - Disclosure - Related-Party Transactions</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/RelatedPartyTransactions</Role>
      <ShortName>Related-Party Transactions</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R21.htm</HtmlFileName>
      <LongName>0215 - Disclosure - Quarterly Information (Unaudited)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/QuarterlyInformation</Role>
      <ShortName>Quarterly Information (Unaudited)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R22.htm</HtmlFileName>
      <LongName>0216 - Disclosure - Subsequent Events</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/SubsequentEvents</Role>
      <ShortName>Subsequent Events</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R23.htm</HtmlFileName>
      <LongName>0401 - Disclosure - Summary of Significant Accounting Policies and Nature of Operations (Policies)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/SummaryOfSignificantAccountingPoliciesAndNatureOfOperationsPolicies</Role>
      <ShortName>Summary of Significant Accounting Policies and Nature of Operations (Policies)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R24.htm</HtmlFileName>
      <LongName>0501 - Disclosure - Summary of Significant Accounting Policies and Nature of Operations (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/SummaryOfSignificantAccountingPoliciesAndNatureOfOperationsTables</Role>
      <ShortName>Summary of Significant Accounting Policies and Nature of Operations (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R25.htm</HtmlFileName>
      <LongName>0502 - Disclosure - Investments (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/InvestmentsTables</Role>
      <ShortName>Investments (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R26.htm</HtmlFileName>
      <LongName>0503 - Disclosure - Fair Value Measurements (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/FairValueMeasurementsTables</Role>
      <ShortName>Fair Value Measurements (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R27.htm</HtmlFileName>
      <LongName>0504 - Disclosure - Property and Equipment, Net (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/PropertyAndEquipmentNetTables</Role>
      <ShortName>Property and Equipment, Net (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R28.htm</HtmlFileName>
      <LongName>0505 - Disclosure - Business Combination (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/BusinessCombinationTables</Role>
      <ShortName>Business Combination (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R29.htm</HtmlFileName>
      <LongName>0506 - Disclosure - Goodwill and Intangible Assets (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/GoodwillAndIntangibleAssetsTables</Role>
      <ShortName>Goodwill and Intangible Assets (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R30.htm</HtmlFileName>
      <LongName>0508 - Disclosure - Stockholders' Equity and Share-Based Compensation (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/StockholdersEquityAndShareBasedCompensationTables</Role>
      <ShortName>Stockholders' Equity and Share-Based Compensation (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R31.htm</HtmlFileName>
      <LongName>0509 - Disclosure - Net Loss Per Share (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/NetLossPerShareTables</Role>
      <ShortName>Net Loss Per Share (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R32.htm</HtmlFileName>
      <LongName>0510 - Disclosure - Income Taxes (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/IncomeTaxesTables</Role>
      <ShortName>Income Taxes (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R33.htm</HtmlFileName>
      <LongName>0511 - Disclosure - Commitments and Contingencies (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/CommitmentsAndContingenciesTables</Role>
      <ShortName>Commitments and Contingencies (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R34.htm</HtmlFileName>
      <LongName>0515 - Disclosure - Quarterly Information (Unaudited) (Tables)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/QuarterlyInformationTables</Role>
      <ShortName>Quarterly Information (Unaudited) (Tables)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R35.htm</HtmlFileName>
      <LongName>0601 - Disclosure - Summary of Significant Accounting Policies and Nature of Operations (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/SummaryOfSignificantAccountingPoliciesAndNatureOfOperationsDetails</Role>
      <ShortName>Summary of Significant Accounting Policies and Nature of Operations (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R36.htm</HtmlFileName>
      <LongName>06011 - Disclosure - Summary of Significant Accounting Policies and Nature of Operations (Details 1)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/SummaryOfSignificantAccountingPoliciesAndNatureOfOperationsDetails1</Role>
      <ShortName>Summary of Significant Accounting Policies and Nature of Operations (Details 1)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R37.htm</HtmlFileName>
      <LongName>06012 - Disclosure - Summary of Significant Accounting Policies and Nature of Operations (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/SummaryOfSignificantAccountingPoliciesAndNatureOfOperationsDetailsTextual</Role>
      <ShortName>Summary of Significant Accounting Policies and Nature of Operations (Details Textual)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R38.htm</HtmlFileName>
      <LongName>0602 - Disclosure - Investments (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/InvestmentsDetails</Role>
      <ShortName>Investments (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R39.htm</HtmlFileName>
      <LongName>06021 - Disclosure - Investments (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/InvestmentsDetailsTextual</Role>
      <ShortName>Investments (Details Textual)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R40.htm</HtmlFileName>
      <LongName>0603 - Disclosure - Fair Value Measurements (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/FairValueMeasurementsDetails</Role>
      <ShortName>Fair Value Measurements (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R41.htm</HtmlFileName>
      <LongName>06031 - Disclosure - Fair Value Measurements (Details 1)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/FairValueMeasurementsDetails1</Role>
      <ShortName>Fair Value Measurements (Details 1)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R42.htm</HtmlFileName>
      <LongName>06032 - Disclosure - Fair Value Measurements (Details 2)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/FairValueMeasurementsDetails2</Role>
      <ShortName>Fair Value Measurements (Details 2)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R43.htm</HtmlFileName>
      <LongName>06033 - Disclosure - Fair Value Measurements (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/FairValueMeasurementsDetailsTextual</Role>
      <ShortName>Fair Value Measurements (Details Textual)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R44.htm</HtmlFileName>
      <LongName>0604 - Disclosure - Property and Equipment, Net (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/PropertyAndEquipmentNetDetails</Role>
      <ShortName>Property and Equipment, Net (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R45.htm</HtmlFileName>
      <LongName>06041 - Disclosure - Property and Equipment, Net (Details 1)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/PropertyAndEquipmentNetDetails1</Role>
      <ShortName>Property and Equipment, Net (Details 1)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R46.htm</HtmlFileName>
      <LongName>06042 - Disclosure - Property and Equipment, Net (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/PropertyAndEquipmentNetDetailsTextual</Role>
      <ShortName>Property and Equipment, Net (Details Textual)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R47.htm</HtmlFileName>
      <LongName>0605 - Disclosure - Business Combination (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/BusinessCombinationDetails</Role>
      <ShortName>Business Combination (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R48.htm</HtmlFileName>
      <LongName>06051 - Disclosure - Business Combination (Details 1)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/BusinessCombinationDetails1</Role>
      <ShortName>Business Combination (Details 1)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R49.htm</HtmlFileName>
      <LongName>06052 - Disclosure - Business Combination (Details 2)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/BusinessCombinationDetails2</Role>
      <ShortName>Business Combination (Details 2)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R50.htm</HtmlFileName>
      <LongName>06053 - Disclosure - Business Combination (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/BusinessCombinationDetailsTextual</Role>
      <ShortName>Business Combination (Details Textual)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R51.htm</HtmlFileName>
      <LongName>0606 - Disclosure - Goodwill and Intangible Assets (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/GoodwillAndIntangibleAssetsDetails</Role>
      <ShortName>Goodwill and Intangible Assets (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R52.htm</HtmlFileName>
      <LongName>06061 - Disclosure - Goodwill and Intangible Assets (Details 1)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/GoodwillAndIntangibleAssetsDetails1</Role>
      <ShortName>Goodwill and Intangible Assets (Details 1)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R53.htm</HtmlFileName>
      <LongName>06062 - Disclosure - Goodwill and Intangible Assets (Details 2)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/GoodwillAndIntangibleAssetsDetails2</Role>
      <ShortName>Goodwill and Intangible Assets (Details 2)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R54.htm</HtmlFileName>
      <LongName>06063 - Disclosure - Goodwill and Intangible Assets (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/GoodwillAndIntangibleAssetsDetailsTextual</Role>
      <ShortName>Goodwill and Intangible Assets (Details Textual)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>0607 - Disclosure - Borrowings (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/BorrowingsDetailsTextual</Role>
      <ShortName>Borrowings (Details Textual)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>0608 - Disclosure - Stockholders' Equity and Share-Based Compensation (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/StockholdersEquityAndShareBasedCompensationDetails</Role>
      <ShortName>Stockholders' Equity and Share-Based Compensation (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>06081 - Disclosure - Stockholders' Equity and Share-Based Compensation (Details 1)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/StockholdersEquityAndShareBasedCompensationDetails1</Role>
      <ShortName>Stockholders' Equity and Share-Based Compensation (Details 1)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R58.htm</HtmlFileName>
      <LongName>06082 - Disclosure - Stockholders' Equity and Share-Based Compensation (Details 2)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/StockholdersEquityAndShareBasedCompensationDetails2</Role>
      <ShortName>Stockholders' Equity and Share-Based Compensation (Details 2)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R59.htm</HtmlFileName>
      <LongName>06083 - Disclosure - Stockholders' Equity and Share-Based Compensation (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/StockholdersEquityAndShareBasedCompensationDetailsTextual</Role>
      <ShortName>Stockholders' Equity and Share-Based Compensation (Details Textual)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R60.htm</HtmlFileName>
      <LongName>0609 - Disclosure - Net Loss Per Share (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/NetLossPerShareDetails</Role>
      <ShortName>Net Loss Per Share (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R61.htm</HtmlFileName>
      <LongName>06091 - Disclosure - Net Loss Per Share (Details 1)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/NetLossPerShareDetails1</Role>
      <ShortName>Net Loss Per Share (Details 1)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R62.htm</HtmlFileName>
      <LongName>0610 - Disclosure - Income Taxes (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/IncomeTaxesDetails</Role>
      <ShortName>Income Taxes (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R63.htm</HtmlFileName>
      <LongName>06101 - Disclosure - Income Taxes (Details 1)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/IncomeTaxesDetails1</Role>
      <ShortName>Income Taxes (Details 1)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R64.htm</HtmlFileName>
      <LongName>06102 - Disclosure - Income Taxes (Details 2)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/IncomeTaxesDetails2</Role>
      <ShortName>Income Taxes (Details 2)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R65.htm</HtmlFileName>
      <LongName>06103 - Disclosure - Income Taxes (Details 3)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/IncomeTaxesDetails3</Role>
      <ShortName>Income Taxes (Details 3)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R66.htm</HtmlFileName>
      <LongName>06104 - Disclosure - Income Taxes (Details 4)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/IncomeTaxesDetails4</Role>
      <ShortName>Income Taxes (Details 4)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R67.htm</HtmlFileName>
      <LongName>06105 - Disclosure - Income Taxes (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/IncomeTaxesDetailsTextual</Role>
      <ShortName>Income Taxes (Details Textual)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R68.htm</HtmlFileName>
      <LongName>0611 - Disclosure - Commitments and Contingencies (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/CommitmentsAndContingenciesDetails</Role>
      <ShortName>Commitments and Contingencies (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R69.htm</HtmlFileName>
      <LongName>06111 - Disclosure - Commitments and Contingencies (Details 1)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/CommitmentsAndContingenciesDetails1</Role>
      <ShortName>Commitments and Contingencies (Details 1)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R70.htm</HtmlFileName>
      <LongName>06112 - Disclosure - Commitments and Contingencies (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/CommitmentsAndContingenciesDetailsTextual</Role>
      <ShortName>Commitments and Contingencies (Details Textual)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R71.htm</HtmlFileName>
      <LongName>0612 - Disclosure - Employee Retirement Plan and Deferred Compensation Plan (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/EmployeeRetirementPlanAndDeferredCompensationPlanDetails</Role>
      <ShortName>Employee Retirement Plan and Deferred Compensation Plan (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R72.htm</HtmlFileName>
      <LongName>0613 - Disclosure - Restructuring Costs (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/RestructuringCostsDetailsTextual</Role>
      <ShortName>Restructuring Costs (Details Textual)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R73.htm</HtmlFileName>
      <LongName>0614 - Disclosure - Related Party Transactions (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/RelatedPartyTransactionsDetailsTextual</Role>
      <ShortName>Related Party Transactions (Details Textual)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>0615 - Disclosure - Quarterly Information (Unaudited) (Details)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/QuarterlyInformationDetails</Role>
      <ShortName>Quarterly Information (Unaudited) (Details)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R75.htm</HtmlFileName>
      <LongName>06151 - Disclosure - Quarterly Information (Unaudited) (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/QuarterlyInformationDetailsTextual</Role>
      <ShortName>Quarterly Information (Unaudited) (Details Textual)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>0616 - Disclosure - Subsequent Events (Details Textual)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://usautoparts.net/role/SubsequentEventsDetailsTextual</Role>
      <ShortName>Subsequent Events (Details Textual)</ShortName>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <Logs>
    <Log type="Info">Element prts_OperatingLeasesMonthlyBaseRentCommitment had a mix of decimals attribute values: -5 0.</Log>
    <Log type="Info">Element us-gaap_AccountsReceivableNetCurrent had a mix of decimals attribute values: -5 -3.</Log>
    <Log type="Info">Element us-gaap_AcquiredFiniteLivedIntangibleAssetAmount had a mix of decimals attribute values: -5 -3.</Log>
    <Log type="Info">Element us-gaap_AcquiredIndefiniteLivedIntangibleAssetAmount had a mix of decimals attribute values: -5 -3.</Log>
    <Log type="Info">Element us-gaap_AdditionalPaidInCapitalCommonStock had a mix of decimals attribute values: -3 0.</Log>
    <Log type="Info">Element us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLosses1 had a mix of decimals attribute values: -3 0.</Log>
    <Log type="Info">Element us-gaap_CapitalizedComputerSoftwareAdditions had a mix of decimals attribute values: -5 0.</Log>
    <Log type="Info">Element us-gaap_CommonStockSharesIssued had a mix of decimals attribute values: -3 0.</Log>
    <Log type="Info">Element us-gaap_Goodwill had a mix of decimals attribute values: -5 -3.</Log>
    <Log type="Info">Element us-gaap_ImpairmentOfIntangibleAssetsFinitelived had a mix of decimals attribute values: -5 -3.</Log>
    <Log type="Info">Element us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill had a mix of decimals attribute values: -5 -3.</Log>
    <Log type="Info">Element us-gaap_ImpairmentOfLongLivedAssetsHeldForUse had a mix of decimals attribute values: -5 -3.</Log>
    <Log type="Info">Element us-gaap_IncreaseDecreaseInAccountsReceivable had a mix of decimals attribute values: -5 -3.</Log>
    <Log type="Info">Element us-gaap_LineOfCreditFacilityAmountOutstanding had a mix of decimals attribute values: -6 -5.</Log>
    <Log type="Info">Element us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity had a mix of decimals attribute values: -6 0.</Log>
    <Log type="Info">Element us-gaap_OperatingLossCarryforwards had a mix of decimals attribute values: -5 -3.</Log>
    <Log type="Info">Element us-gaap_PropertyPlantAndEquipmentNet had a mix of decimals attribute values: -5 -3.</Log>
    <Log type="Info">Element us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized had a mix of decimals attribute values: -6 -5.</Log>
    <Log type="Info">Element us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised had a mix of decimals attribute values: -3 0.</Log>
    <Log type="Info">'Shares' elements on report '0130 - Statement - Consolidated Statements of Stockholders' Equity' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '0602 - Disclosure - Investments (Details)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '06033 - Disclosure - Fair Value Measurements (Details Textual)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '06053 - Disclosure - Business Combination (Details Textual)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '06063 - Disclosure - Goodwill and Intangible Assets (Details Textual)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Shares' elements on report '06083 - Disclosure - Stockholders' Equity and Share-Based Compensation (Details Textual)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '06151 - Disclosure - Quarterly Information (Unaudited) (Details Textual)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">Process Flow-Through: 0110 - Statement - Consolidated Balance Sheets</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Jan. 01, 2011'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Jan. 02, 2010'</Log>
    <Log type="Info">Process Flow-Through: 0111 - Statement - Consolidated Balance Sheets (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 0120 - Statement - Consolidated Statements of Comprehensive Operations</Log>
    <Log type="Info">	Process Flow-Through: Removing column '1 Months Ended
Oct. 31, 2012'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '1 Months Ended
Aug. 31, 2012'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Dec. 29, 2012'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Sep. 29, 2012'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Jun. 30, 2012'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Mar. 31, 2012'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Dec. 31, 2011'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Oct. 01, 2011'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Jul. 02, 2011'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Apr. 02, 2011'</Log>
    <Log type="Info">Process Flow-Through: 0140 - Statement - Consolidated Statements of Cash Flows</Log>
  </Logs>
  <InputFiles>
    <File>prts-20121229.xml</File>
    <File>prts-20121229.xsd</File>
    <File>prts-20121229_cal.xml</File>
    <File>prts-20121229_def.xml</File>
    <File>prts-20121229_lab.xml</File>
    <File>prts-20121229_pre.xml</File>
  </InputFiles>
  <SupplementalFiles />
  <BaseTaxonomies />
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
