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Related Party Transactions - Recorded Revenue from Related Parties (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Related Party Transaction [Line Items]    
Total related party revenue $ 42 $ 880
J-Stream [Member]
   
Related Party Transaction [Line Items]    
Total related party revenue 36 815
Dentsu [Member]
   
Related Party Transaction [Line Items]    
Total related party revenue $ 6 $ 65