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Commitments and Contingencies (Operating Commitments) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating commitments, future minimum payments under commitments      
2015 $ 27,437us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
2016 6,460us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
2017 4,061us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
2018 2,070us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
2019 and after 4,641qihu_OperatingLeasesFutureMinimumPaymentsDueInFiveYearsAndThereafter    
Total 44,669us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Rental expenses under operating leases $ 12,871us-gaap_OperatingLeasesRentExpenseNet $ 5,057us-gaap_OperatingLeasesRentExpenseNet $ 5,967us-gaap_OperatingLeasesRentExpenseNet