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Segment Reporting (Segment Reporting Information) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 segment | Sep. 30, 2012
Segment Reporting [Abstract] |  |  |  |
Reportable segments (in number of segments) |  |  | 5 |
Revenues: |  |  |  |
Total Revenues | $ 432,171 | $ 374,511 | $ 1,239,287 | $ 797,134
Gross Profit: |  |  |  |
Total Gross Profit | 130,616 | 115,631 | 368,457 | 252,917
Operating Income (Loss): |  |  |  |
Total Operating Income | 36,888 | 31,528 | 93,460 | 56,378
Apex |  |  |  |
Revenues: |  |  |  |
Total Revenues | 246,369 | 202,664 | 692,543 | 301,167
Gross Profit: |  |  |  |
Total Gross Profit | 69,448 | 56,934 | 188,963 | 83,917
Operating Income (Loss): |  |  |  |
Total Operating Income | 20,021 | 13,204 | 46,531 | 9,556
Oxford |  |  |  |
Revenues: |  |  |  |
Total Revenues | 100,005 | 88,104 | 296,741 | 254,970
Gross Profit: |  |  |  |
Total Gross Profit | 34,660 | 31,250 | 101,316 | 90,266
Operating Income (Loss): |  |  |  |
Total Operating Income | 14,084 | 13,251 | 39,509 | 36,007
Life Sciences |  |  |  |
Revenues: |  |  |  |
Total Revenues | 44,124 | 40,646 | 126,474 | 122,506
Gross Profit: |  |  |  |
Total Gross Profit | 14,306 | 14,002 | 41,528 | 41,649
Operating Income (Loss): |  |  |  |
Total Operating Income | 2,146 | 3,020 | 4,093 | 8,291
Physician |  |  |  |
Revenues: |  |  |  |
Total Revenues | 26,223 | 27,479 | 78,991 | 76,607
Gross Profit: |  |  |  |
Total Gross Profit | 7,382 | 8,370 | 22,505 | 23,587
Operating Income (Loss): |  |  |  |
Total Operating Income | 1,416 | 3,207 | 5,497 | 6,269
Healthcare |  |  |  |
Revenues: |  |  |  |
Total Revenues | 15,450 | 15,618 | 44,538 | 41,884
Gross Profit: |  |  |  |
Total Gross Profit | 4,820 | 5,075 | 14,145 | 13,498
Operating Income (Loss): |  |  |  |
Total Operating Income | $ (779) | $ (1,154) | $ (2,170) | $ (3,745)

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