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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2012
Segment Information [Abstract]  
Reconciliation of Revenue from Segments to Consolidated [Table Text Block]
For the years ended December 31,2012 2011 2010
Revenues:        
 U.S.$ 5,722,634 $ 4,915,055 $ 4,966,353
 Canada  1,140,264   1,056,031   980,170
 Europe & South Africa  1,372,291   1,249,859   960,235
 Asia Pacific  1,495,545   1,430,414   1,243,464
 Corporate and Other  110,177   178,179   111,508
  Total$ 9,840,911 $ 8,829,538 $ 8,261,730
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]
For the years ended December 31,2012 2011 2010
Income (loss) before income taxes:        
 U.S.$ 636,410 $ 425,637 $ 526,127
 Canada  186,971   164,953   121,738
 Europe & South Africa  73,947   83,102   72,125
 Asia Pacific  45,378   42,234   73,882
 Corporate and Other  (23,483)   47,645   12,309
  Total$ 919,223 $ 763,571 $ 806,181
Reconciliation of Assets from Segment to Consolidated [Table Text Block]
For the years ended December 31,2012 2011 2010
Assets:        
 U.S.$ 24,924,363 $ 17,965,559 $ 17,301,434
 Canada  3,764,002   3,347,771   3,341,062
 Europe & South Africa  2,235,199   1,846,751   1,513,323
 Asia Pacific  3,208,732   2,902,101   2,369,435
 Corporate and Other  6,228,142   5,571,791   4,144,926
  Total$ 40,360,438 $ 31,633,973 $ 28,670,180
Reconciliation Of Interest Expense From Segment To Consolidated [Table Text Block]
For the years ended December 31,2012 2011 2010
Interest expense:        
 Corporate and Other$ 105,348 $ 102,638 $ 90,996
  Total$ 105,348 $ 102,638 $ 90,996
Reconciliation Of Depreciation And Amortization From Segment To Consolidated [Table Text Block]
For the years ended December 31,2012 2011 2010
Depreciation and amortization:        
 U.S.$ 781,483 $ 467,266 $ 753,130
 Canada  182,914   168,874   164,120
 Europe & South Africa  69,718   58,714   60,121
 Asia Pacific  154,362   191,957   141,001
 Corporate and Other  4,040   9,002   8,405
  Total$ 1,192,517 $ 895,813 $ 1,126,777
           
The table above includes amortization of deferred acquisition costs, including the effect from investment related gains and losses.
          
Premium Concentration [Table Text Block]
  Gross Premiums from Percentage of Segment
  Five Largest Clients Gross Premiums
For the years ended December 31,2012 2011 2012 2011
 U.S.$ 1,511,414 $ 1,401,487 33.4% 33.5%
 Canada  513,945   503,472 53.1  53.6 
 Europe & South Africa  671,511   634,156 50.2  51.8 
 Asia Pacific  550,975   603,541 39.6  45.0 
 Consolidated  1,913,475   1,887,095 23.2  24.5