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Segment Information (Details 1) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Summary of total revenue by product |  |  |
Total revenue | $ 762,966 | $ 637,063 | $ 484,635
Click-based advertising [Member] |  |  |
Summary of total revenue by product |  |  |
Total revenue | 587,781 | 499,993 | 383,543
Display-based advertising [Member] |  |  |
Summary of total revenue by product |  |  |
Total revenue | 94,147 | 85,736 | 71,848
Subscription, transaction and other [Member] |  |  |
Summary of total revenue by product |  |  |
Total revenue | $ 81,038 | $ 51,334 | $ 29,244

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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + 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=6880815&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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