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Consolidated Statements of Cash Flows (Parenthetical) (Convertible Senior Notes [Member], USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Convertible Senior Notes [Member]
    
Debt issuance costs $ 18,630qihu_DebtIssuanceCostsExcludingAuditingFee
/ us-gaap_LongtermDebtTypeAxis
= qihu_ConvertibleSeniorNotesMember		 $ 12,150qihu_DebtIssuanceCostsExcludingAuditingFee
/ us-gaap_LongtermDebtTypeAxis
= qihu_ConvertibleSeniorNotesMember