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Summary of Significant Accounting Policies - Revenue by geographic areas (Details) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 United States | Dec. 31, 2011 United States | Dec. 31, 2010 United States | Dec. 31, 2012 Europe | Dec. 31, 2011 Europe | Dec. 31, 2010 Europe | Dec. 31, 2012 Asia and rest of world | Dec. 31, 2011 Asia and rest of world | Dec. 31, 2010 Asia and rest of world
Revenues: (in thousands) | $ 13,564,764 | $ 17,510,780 | $ 13,498,196 | $ 8,078 | $ 11,624 | $ 10,205 | $ 3,554 | $ 4,092 | $ 2,742 | $ 1,933 | $ 1,795 | $ 551

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration