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Mainland China Contribution Plan and Profit Appropriation (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Contribution Plan and Profit Appropriation [Abstract]      
Provisions for full time employees benefits related to mandated contribution plan $ 54,926us-gaap_DefinedContributionPlanCostRecognized $ 31,441us-gaap_DefinedContributionPlanCostRecognized $ 18,125us-gaap_DefinedContributionPlanCostRecognized
Minimum percentage of after-tax income to reserve fund before payment of dividends, required by local government 10.00%qihu_MinimumPercentageOfAnnualAppropriationsToGeneralReserveFundRequiredByLocalGovernment    
Appropriation amount to statutory reserve funds $ 21,284qihu_AppropriationAmountToStatutoryReserveFunds $ 12,074qihu_AppropriationAmountToStatutoryReserveFunds $ 10,408qihu_AppropriationAmountToStatutoryReserveFunds