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Restricted Net Assets (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Restricted Net Assets [Line Items]    
Minimum percentage of after-tax income to reserve fund before payment of dividends, required by local government 10.00%qihu_MinimumPercentageOfAnnualAppropriationsToGeneralReserveFundRequiredByLocalGovernment  
Restricted net assets $ 474,595us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries $ 261,895us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries
Paid in capital and statutory reserves [Member] | VIEs and VIEs' Subsidiaries [Member]    
Restricted Net Assets [Line Items]    
Restricted net assets 246,880us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
/ us-gaap_StatementEquityComponentsAxis
= qihu_PaidInCapitalAndStatutoryReservesMember		 89,243us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
/ us-gaap_StatementEquityComponentsAxis
= qihu_PaidInCapitalAndStatutoryReservesMember
Paid in capital and statutory reserves [Member] | PRC subsidiaries [Member]    
Restricted Net Assets [Line Items]    
Restricted net assets $ 227,715us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_StatementEquityComponentsAxis
= qihu_PaidInCapitalAndStatutoryReservesMember		 $ 172,652us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
/ us-gaap_StatementEquityComponentsAxis
= qihu_PaidInCapitalAndStatutoryReservesMember