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Ordinary Shares (Details) (USD $)
 1 Months Ended 12 Months Ended 1 Months Ended
Jul. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Aug. 31, 2012
Jul. 31, 2012
Oct. 31, 2014
Jan. 31, 2012
Schedule of Ordinary Shares [Line Items]                  
Prepayment for share repurchase   $ 104,201,000qihu_PrepaymentForShareRepurchase [1] $ 0qihu_PrepaymentForShareRepurchase   0qihu_PrepaymentForShareRepurchase        
Overseas internet service company [Member]                  
Schedule of Ordinary Shares [Line Items]                  
Percentage of equity interest acquired 51.00%qihu_PercentageOfEconomicOwnershipSubsidiariesViesAndViesSubsidiaries
/ us-gaap_BusinessAcquisitionAxis
= qihu_OverseasInternetServiceCompanyMember		                
A related party of the Company [Member] | Overseas internet service company [Member]                  
Schedule of Ordinary Shares [Line Items]                  
Percentage of equity interest acquired 28.53%qihu_PercentageOfEconomicOwnershipSubsidiariesViesAndViesSubsidiaries
/ us-gaap_BusinessAcquisitionAxis
= qihu_OverseasInternetServiceCompanyMember
/ qihu_ShareholdersAxis
= qihu_SellingShareholderOneMember		                
Ordinary shares [Member]                  
Schedule of Ordinary Shares [Line Items]                  
Ordinary shares, shares authorized   500,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 500,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 500,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 500,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		        
Ordinary shares, par value   $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 0.001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		        
Ordinary shares, shares issued for future delivery to employees and nonemployees   4,525,410us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 4,543,902us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 5,127,846us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		          
Ordinary shares [Member] | A related party of the Company [Member]                  
Schedule of Ordinary Shares [Line Items]                  
Issuance of ordinary shares in connection with business acquisitions, shares (in shares)         51,722us-gaap_StockIssuedDuringPeriodSharesAcquisitions
/ qihu_ShareholdersAxis
= qihu_SellingShareholderOneMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		        
Ordinary shares [Member] | Selling shareholder two [Member]                  
Schedule of Ordinary Shares [Line Items]                  
Issuance of ordinary shares in connection with business acquisitions, shares (in shares)         76,372us-gaap_StockIssuedDuringPeriodSharesAcquisitions
/ qihu_ShareholdersAxis
= qihu_SellingShareholderTwoMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		        
Ordinary shares [Member] | Selling shareholder three [Member]                  
Schedule of Ordinary Shares [Line Items]                  
Issuance of ordinary shares in connection with business acquisitions, shares (in shares)         76,372us-gaap_StockIssuedDuringPeriodSharesAcquisitions
/ qihu_ShareholdersAxis
= qihu_SellingShareholderThreeMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		        
ADS [Member]                  
Schedule of Ordinary Shares [Line Items]                  
Stock repurchase program, authorized amount               $ 200,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_StatementClassOfStockAxis
= qihu_AmericanDepositarySharesMember		 $ 50,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_StatementClassOfStockAxis
= qihu_AmericanDepositarySharesMember
Stock repurchase program, number of shares repurchased but not complete legal process of registation           8,796qihu_StockRepurchaseProgramNumberOfSharesRepurchasedButNotCompleteLegalProcessOfRegistation
/ us-gaap_StatementClassOfStockAxis
= qihu_AmericanDepositarySharesMember		 900qihu_StockRepurchaseProgramNumberOfSharesRepurchasedButNotCompleteLegalProcessOfRegistation
/ us-gaap_StatementClassOfStockAxis
= qihu_AmericanDepositarySharesMember		    
Stock repurchase program, repurchase price           $ 14.31us-gaap_SharePrice
/ us-gaap_StatementClassOfStockAxis
= qihu_AmericanDepositarySharesMember		 $ 14.50us-gaap_SharePrice
/ us-gaap_StatementClassOfStockAxis
= qihu_AmericanDepositarySharesMember		    
Class A ordinary shares [Member]                  
Schedule of Ordinary Shares [Line Items]                  
Ordinary shares, shares authorized   378,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 378,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		   378,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		        
Ordinary shares, par value   $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		   0.001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		        
Ordinary shares, shares outstanding   147,485,168us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 134,123,218us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		   134,123,218us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		        
Class B ordinary shares [Member]                  
Schedule of Ordinary Shares [Line Items]                  
Ordinary shares, shares authorized   122,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 122,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		   122,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		        
Ordinary shares, par value   $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		   0.001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		        
Ordinary shares, shares outstanding   45,931,163us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 54,767,703us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		   54,767,703us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		        
[1] The board of directors of the Group approved a $200 million share repurchase program in October 2014. As of December 31, 2014, the Company prepaid $104 million for the repurchase of shares. The Company completed the share repurchase program in February 2015.