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Segment Information (Tables) | 12 Months Ended
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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 |

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