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Acquisitions (Allocation of Purchase Price, Internet Service Business Acquired in January 2014) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 31, 2014
Business Acquisition [Line Items]        
Goodwill $ 344,630us-gaap_Goodwill $ 29,509us-gaap_Goodwill $ 4,628us-gaap_Goodwill  
Internet service company acquired in January 2014 [Member]        
Business Acquisition [Line Items]        
Cash       14,730us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= qihu_InternetServiceCompanyThreeMember
Other net liabilities acquired, excluding intangible assets and related deferred tax liabilities       (18,238)qihu_BusinessCombinationRecognizedIdentifiableOtherNetAssetsAcquiredExcludingAndRelatedDeferredTaxLiabilitiesIntangibleAssets
/ us-gaap_BusinessAcquisitionAxis
= qihu_InternetServiceCompanyThreeMember
Goodwill       60,612us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= qihu_InternetServiceCompanyThreeMember
Deferred tax liability       (3,014)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= qihu_InternetServiceCompanyThreeMember
Total       66,146us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= qihu_InternetServiceCompanyThreeMember
Internet service company acquired in January 2014 [Member] | Non-compete agreement [Member]        
Business Acquisition [Line Items]        
Intangible assets       5,438us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= qihu_InternetServiceCompanyThreeMember
/ qihu_IntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
Internet service company acquired in January 2014 [Member] | Domain name [Member]        
Business Acquisition [Line Items]        
Intangible assets       3,008us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= qihu_InternetServiceCompanyThreeMember
/ qihu_IntangibleAssetsByMajorClassAxis
= us-gaap_InternetDomainNamesMember
Internet service company acquired in January 2014 [Member] | Technology [Member]        
Business Acquisition [Line Items]        
Intangible assets       2,314us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= qihu_InternetServiceCompanyThreeMember
/ qihu_IntangibleAssetsByMajorClassAxis
= qihu_SoftwareTechnologyAndCopyrightsMember
Internet service company acquired in January 2014 [Member] | User base [Member]        
Business Acquisition [Line Items]        
Intangible assets       $ 1,296us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= qihu_InternetServiceCompanyThreeMember
/ qihu_IntangibleAssetsByMajorClassAxis
= qihu_UserBaseMember