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Segment Information (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Segment Total Revenue [Line Items]        
Total revenues $ 2,449,081,000 $ 1,994,907,000 $ 7,117,809,000 $ 6,481,319,000
US Segment Reporting Information [Member]
        
Segment Total Revenue [Line Items]        
Total revenues 1,446,834,000 1,017,413,000 4,141,202,000 3,625,956,000
Canada Segment Reporting Information [Member]
        
Segment Total Revenue [Line Items]        
Total revenues 287,629,000 249,924,000 839,491,000 780,549,000
Europe And South Africa Segment Reporting Information [Member]
        
Segment Total Revenue [Line Items]        
Total revenues 323,225,000 300,492,000 955,505,000 877,880,000
Asia Pacific Segment Reporting Information [Member]
        
Segment Total Revenue [Line Items]        
Total revenues 364,516,000 358,115,000 1,101,934,000 1,044,103,000
Corporate And Other Segment Reporting Information [Member]
        
Segment Total Revenue [Line Items]        
Total revenues $ 26,877,000 $ 68,963,000 $ 79,677,000 $ 152,831,000