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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

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