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      <HtmlFileName>R74.htm</HtmlFileName>
      <LongName>100730 - Disclosure - Computation of Basic and Diluted Net Income (Loss) Per Share Attributable to Common Stockholders (Detail)</LongName>
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      <ShortName>Computation of Basic and Diluted Net Income (Loss) Per Share Attributable to Common Stockholders (Detail)</ShortName>
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      <LongName>100740 - Disclosure - Number of Outstanding Stock Options, Warrants to Purchase Common Preferred Stock and Convertible Redeemable Preferred Stock Excluded from Computation of Diluted Net Income (Loss) Per Share (Detail)</LongName>
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      <ShortName>Number of Outstanding Stock Options, Warrants to Purchase Common Preferred Stock and Convertible Redeemable Preferred Stock Excluded from Computation of Diluted Net Income (Loss) Per Share (Detail)</ShortName>
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    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R76.htm</HtmlFileName>
      <LongName>100750 - Disclosure - Income Taxes - Additional Information (Detail)</LongName>
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      <LongName>100770 - Disclosure - Reconciliation of Income Tax at U.S. Statutory Rate to Effective Income Tax Rate (Detail)</LongName>
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      <HtmlFileName>R80.htm</HtmlFileName>
      <LongName>100790 - Disclosure - Segment Reporting (Restated) - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
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      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R81.htm</HtmlFileName>
      <LongName>100800 - Disclosure - Financial Information of Segments (Detail)</LongName>
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      <ShortName>Financial Information of Segments (Detail)</ShortName>
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      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R82.htm</HtmlFileName>
      <LongName>100810 - Disclosure - Contingencies - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.lifelock.com/20131231/taxonomy/role/DisclosureContingenciesAdditionalInformationDetail</Role>
      <ShortName>Contingencies - Additional Information (Detail)</ShortName>
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      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R83.htm</HtmlFileName>
      <LongName>100820 - Disclosure - Selected Quarterly Financial Data - (unaudited) (Restated) (Detail)</LongName>
      <ReportType>Sheet</ReportType>
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      <HasEmbeddedReports>false</HasEmbeddedReports>
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      <LongName>100830 - Disclosure - Effect of Correction of Error and Other Adjustments on Previously reported consolidated financial statements - (Restated) (Detail)</LongName>
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      <ShortName>Effect of Correction of Error and Other Adjustments on Previously reported consolidated financial statements - (Restated) (Detail)</ShortName>
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      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R85.htm</HtmlFileName>
      <LongName>100840 - Disclosure - Valuation And Qualifying Accounts (Detail)</LongName>
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      <ShortName>Valuation And Qualifying Accounts (Detail)</ShortName>
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    <Log type="Info">'Monetary' elements on report '100660 - Disclosure - Share-Based Compensation - Additional Information (Detail)' had a mix of different decimal attribute values.</Log>
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    <Log type="Info">Process Flow-Through: 100010 - Statement - Consolidated Balance Sheets</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2011'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2010'</Log>
    <Log type="Info">Process Flow-Through: 100020 - Statement - Consolidated Balance Sheets (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 100030 - Statement - Consolidated Statements of Operations</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Dec. 31, 2013'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Sep. 30, 2013'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Jun. 30, 2013'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Mar. 31, 2013'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Dec. 31, 2012'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Sep. 30, 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: 100040 - Statement - Consolidated Statements of Comprehensive Income (Loss)</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Dec. 31, 2013'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Sep. 30, 2013'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Jun. 30, 2013'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Mar. 31, 2013'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Dec. 31, 2012'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '3 Months Ended
Sep. 30, 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: 100060 - Statement - Consolidated Statements of Cash Flows</Log>
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