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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.

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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