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Segment Information (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Total Revenues [Line Items]                      
Total revenues $ 2,723,102,000 $ 2,449,081,000 $ 2,375,753,000 $ 2,292,975,000 $ 2,348,219,000 $ 1,994,907,000 $ 2,203,977,000 $ 2,282,435,000 $ 9,840,911,000 $ 8,829,538,000 $ 8,261,730,000
US Segment Reporting Information [Member]
                      
Segment Total Revenues [Line Items]                      
Total revenues                 5,722,634,000 4,915,055,000 4,966,353,000
Canada Segment Reporting Information [Member]
                      
Segment Total Revenues [Line Items]                      
Total revenues                 1,140,264,000 1,056,031,000 980,170,000
Europe And South Africa Segment Reporting Information [Member]
                      
Segment Total Revenues [Line Items]                      
Total revenues                 1,372,291,000 1,249,859,000 960,235,000
Asia Pacific Segment Reporting Information [Member]
                      
Segment Total Revenues [Line Items]                      
Total revenues                 1,495,545,000 1,430,414,000 1,243,464,000
Corporate And Other Segment Reporting Information [Member]
                      
Segment Total Revenues [Line Items]                      
Total revenues                 $ 110,177,000 $ 178,179,000 $ 111,508,000