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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