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Segment Information (Details) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Segment Total Revenue [Line Items] |  |
Total revenues | $ 2,601,102,000 | $ 2,292,975,000
US Segment Reporting Information [Member] |  |
Segment Total Revenue [Line Items] |  |
Total revenues | 1,500,264,000 | 1,324,147,000
Canada Segment Reporting Information [Member] |  |
Segment Total Revenue [Line Items] |  |
Total revenues | 297,089,000 | 275,623,000
Europe And South Africa Segment Reporting Information [Member] |  |
Segment Total Revenue [Line Items] |  |
Total revenues | 339,229,000 | 308,337,000
Asia Pacific Segment Reporting Information [Member] |  |
Segment Total Revenue [Line Items] |  |
Total revenues | 388,969,000 | 359,685,000
Corporate And Other Segment Reporting Information [Member] |  |
Segment Total Revenue [Line Items] |  |
Total revenues | $ 75,551,000 | $ 25,183,000

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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 SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 1 Reference 2: 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 + Details
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