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Revenues by Revenue Sources (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Revenue [Line Items]        
Total Revenue $ 40,560 $ 33,691 $ 112,870 $ 100,358
Partner and Other Revenue Sources
       
Revenue [Line Items]        
Total Revenue 37,412 31,664 105,743 91,372
Proprietary Web site Traffic Sources and Other Revenue
       
Revenue [Line Items]        
Total Revenue $ 3,148 $ 2,027 $ 7,127 $ 8,986