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Intangible Assets from Acquisitions (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 7,900 $ 10,660
Less accumulated amortization (7,040) [1] (7,300) [1]
Net 860 3,360
Advertiser relationship
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 3,070 3,070
Less accumulated amortization (3,046) [1] (2,125) [1]
Net 24 945
Distribution partner relationship
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 4,830 4,830
Less accumulated amortization (3,994) [1] (2,787) [1]
Net 836 2,043
Acquired technology
    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount   2,760
Less accumulated amortization   (2,388) [1]
Net   $ 372
[1] Excludes the original cost and accumulated amortization of fully-amortized intangible assets which were $82.1 million and $84.7 million at December 31, 2012 and September 30, 2013, respectively.