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Segment Information (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Summary of revenue by geographic area |  |  |
Total revenue | $ 762,966 | $ 637,063 | $ 484,635
United States [Member] |  |  |
Summary of revenue by geographic area |  |  |
Total revenue | 386,221 | 348,066 | 297,830
United Kingdom [Member] |  |  |
Summary of revenue by geographic area |  |  |
Total revenue | 110,213 | 99,646 | 69,721
All other countries [Member] |  |  |
Summary of revenue by geographic area |  |  |
Total revenue | $ 266,542 | $ 189,351 | $ 117,084

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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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