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Changes in Carrying Amount of Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Goodwill [Line Items]  
Beginning Balance $ 65,815
Sale of certain pay-per-click advertising assets (136)
Ending Balance 65,679
Call-Driven
 
Goodwill [Line Items]  
Beginning Balance 63,305
Sale of certain pay-per-click advertising assets   
Ending Balance 63,305
Archeo
 
Goodwill [Line Items]  
Beginning Balance 2,510
Sale of certain pay-per-click advertising assets (136)
Ending Balance $ 2,374