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Land Use Rights, Net (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Land Use Rights, Net [Abstract]      
Land use rights $ 143,194qihu_LandUseRightsGross $ 77,590qihu_LandUseRightsGross  
Less: accumulated depreciation and amortization 4,087qihu_LandUseRightsAccumulatedDepreciationAndAmortization 1,892qihu_LandUseRightsAccumulatedDepreciationAndAmortization  
Land use rights, net 139,107qihu_LandUseRightsNet 75,698qihu_LandUseRightsNet  
Land use rights, amortization expenses 2,256qihu_LandUseRightsAmortizationExpenses 1,714qihu_LandUseRightsAmortizationExpenses 140qihu_LandUseRightsAmortizationExpenses
Land use rights, future amortization expense per year in next five years $ 3,278qihu_LandUseRightsFutureAmortizationExpensePerYearInNextFiveYears