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Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Segment Total Revenue [Line Items] |  |  |  |
Total revenues | $ 2,590,642 | $ 2,375,753 | $ 5,191,744 | $ 4,668,728
US Segment Reporting Information [Member] |  |  |  |
Segment Total Revenue [Line Items] |  |  |  |
Total revenues | 1,564,386 | 1,370,221 | 3,064,650 | 2,694,368
Canada Segment Reporting Information [Member] |  |  |  |
Segment Total Revenue [Line Items] |  |  |  |
Total revenues | 295,325 | 276,239 | 592,414 | 551,862
Europe And South Africa Segment Reporting Information [Member] |  |  |  |
Segment Total Revenue [Line Items] |  |  |  |
Total revenues | 338,910 | 323,943 | 678,139 | 632,280
Asia Pacific Segment Reporting Information [Member] |  |  |  |
Segment Total Revenue [Line Items] |  |  |  |
Total revenues | 368,173 | 377,733 | 757,142 | 737,418
Corporate And Other Segment Reporting Information [Member] |  |  |  |
Segment Total Revenue [Line Items] |  |  |  |
Total revenues | $ 23,848 | $ 27,617 | $ 99,399 | $ 52,800

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + 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=26872669&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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