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Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Loss Contingencies [Line Items]    
Value of the service guarantee $ 1.0  
Unfavorable regulatory action | Pending litigation | In re LifeLock, Inc. Securities Litigation    
Loss Contingencies [Line Items]    
Accrued liability for legal settlement   $ 20.0