General (Details) (USD $)
In Millions, unless otherwise specified
Apr. 30, 2012
Peer39, Inc
Sep. 01, 2011
EyeWonder LLC and Chors GmbH ("EyeWonder")
Jul. 26, 2011
MediaMind Technologies ("Mediamind")
Apr. 02, 2011
MIJO Corporation ("MIJO")
Acquisition        
Net assets acquired $ 15.7 $ 61.0 $ 499.3 $ 43.8