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Business Segments (Segment Reporting 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 segment | Dec. 31, 2011 | Dec. 31, 2010
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 380,381,000 | $ 374,511,000 | $ 265,863,000 | $ 156,760,000 | $ 148,029,000 | $ 147,014,000 | $ 132,862,000 | $ 119,734,000 | $ 1,177,515,000 |  | $ 547,639,000 |  | $ 401,320,000 |
Gross Profit: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross profit | 115,619,000 | 115,631,000 | 84,537,000 | 52,749,000 | 50,151,000 | 50,793,000 | 46,179,000 | 40,705,000 | 368,536,000 |  | 187,828,000 |  | 139,331,000 |
Operating Income (Loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  | 84,952,000 |  | 40,083,000 |  | 16,221,000 |
Reportable segments (in number of segments) |  |  |  |  |  |  |  |  | 5 |  |  |  |  |
Apex |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 508,743,000 |  | 0 |  | 0 |
Gross Profit: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 140,669,000 |  | 0 |  | 0 |
Operating Income (Loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  | 21,593,000 | [1] | 0 | [1] | 0 | [1]
Oxford |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 345,380,000 |  | 266,742,000 |  | 178,688,000 |
Gross Profit: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 122,043,000 |  | 94,967,000 |  | 64,775,000 |
Operating Income (Loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  | 48,802,000 |  | 31,816,000 |  | 13,910,000 |
Life Sciences |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 162,799,000 |  | 155,324,000 |  | 109,495,000 |
Gross Profit: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 55,874,000 |  | 52,643,000 |  | 37,776,000 |
Operating Income (Loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  | 11,626,000 |  | 10,727,000 |  | 5,305,000 |
Healthcare |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 57,914,000 |  | 44,956,000 |  | 39,542,000 |
Gross Profit: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 18,495,000 |  | 14,360,000 |  | 12,933,000 |
Operating Income (Loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  | (5,452,000) |  | (7,807,000) |  | (8,004,000) |
Physician |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 102,679,000 |  | 80,617,000 |  | 73,595,000 |
Gross Profit: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  |  |  |  | 31,455,000 |  | 25,858,000 |  | 23,847,000 |
Operating Income (Loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  | 8,383,000 |  | 5,347,000 |  | 5,010,000 |
Apex Systems |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition costs expensed |  |  |  |  |  |  |  |  | $ 9,800,000 |  |  |  |  |
[1] | Apex operating income includes acquisition related costs of $9.8 million for the twelve months ended December 31, 2012.

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