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Revenues by Revenue Sources (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Revenue [Line Items]    
Total Revenue $ 50,496 $ 34,732
Partner and Other Revenue Sources
   
Revenue [Line Items]    
Total Revenue 46,870 32,841
Proprietary Web site Traffic Sources and Domain Names
   
Revenue [Line Items]    
Total Revenue $ 3,626 $ 1,891