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Revenues by Revenue Sources (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Revenue [Line Items] |  |  |  |
Total Revenue | $ 40,560 | $ 33,691 | $ 112,870 | $ 100,358
Partner and Other Revenue Sources |  |  |  |
Revenue [Line Items] |  |  |  |
Total Revenue | 37,412 | 31,664 | 105,743 | 91,372
Proprietary Web site Traffic Sources and Other Revenue |  |  |  |
Revenue [Line Items] |  |  |  |
Total Revenue | $ 3,148 | $ 2,027 | $ 7,127 | $ 8,986

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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