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Prepaid Expenses and Other Current Assets (Narrative) (Details) (ADS [Member], USD $)
In Millions, unless otherwise specified
Oct. 31, 2014
Jan. 31, 2012
ADS [Member]
    
Schedule of Prepaid Expenses and Other Current Assets [Line Items]    
Stock repurchase program, authorized amount $ 200us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_StatementClassOfStockAxis
= qihu_AmericanDepositarySharesMember		 $ 50us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_StatementClassOfStockAxis
= qihu_AmericanDepositarySharesMember