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Acquisitions (Tables)
 12 Months Ended
Dec. 31, 2015
Internet service company acquired in January 2014 [Member]  
Business Acquisition [Line Items]  
Business Acquisition, Purchase Price Allocation
   US$ 
     
Cash  $14,730 
Other net liabilities acquired, excluding intangible assets and related deferred tax liabilities   (18,238)
Intangible assets     
Non-compete agreement   5,438 
Domain name   3,008 
Technology   2,314 
User base   1,296 
Goodwill   60,612 
Deferred tax liability   (3,014)
Total  $66,146 
Internet service company acquired in May 2014 [Member]  
Business Acquisition [Line Items]  
Business Acquisition, Purchase Price Allocation
   US$ 
     
Cash  $49,564 
Other net liabilities acquired, excluding intangible assets and the related deferred tax liabilities   (10,372)
Intangible assets     
Technology   9,377 
Non-compete agreement   3,259 
Customer relationship   1,204 
Goodwill   148,751 
Deferred tax liability   (2,076)
Non-controlling interest   (65,375)
Total  $134,332 
Enterprise information security business acquired in October 2014 [Member]  
Business Acquisition [Line Items]  
Business Acquisition, Purchase Price Allocation
   US$ 
     
Cash  $50,292 
Other net liabilities acquired, excluding intangible assets and related deferred tax liabilities   (22,324)
Intangible assets     
Distributor relationships   7,006 
Technology   3,436 
Operating license   1,808 
Customer relationships   1,303 
Backlog   1,254 
Trademarks   880 
Goodwill   115,757 
Deferred tax liability   (2,353)
Non-controlling interest   (30,994)
Total  $126,065 
Aggregated individually material acquirees acquired in 2014 [Member]  
Business Acquisition [Line Items]  
Business Acquisition, Pro Forma Information
   Year ended December 31, 
   2013   2014 
   (Unaudited)   (Unaudited) 
         
Pro forma revenue   841,573    1,415,532 
Pro forma net income   106,846    212,558 
Pro forma earnings per ordinary share-basic  $0.59   $1.15 
Pro forma earnings per ordinary share-diluted  $0.55   $1.08 
Aggregated individually material acquirees acquired in 2013 [Member]  
Business Acquisition [Line Items]  
Business Acquisition, Pro Forma Information
   Year ended December 31, 
   2012   2013 
   (Unaudited)   (Unaudited) 
         
Pro forma revenue   336,774    676,414 
Pro forma net income   43,857    95,937 
Pro forma earnings per ordinary share-basic  $0.25   $0.53 
Pro forma earnings per ordinary share-diluted  $0.24   $0.50