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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 | $ 401,659,000 | $ 388,283,000 | $ 282,685,000 | $ 167,078,000 | $ 161,790,000 | $ 162,370,000 | $ 143,683,000 | $ 129,438,000 | $ 1,239,705,000 |  | $ 597,281,000 |  | $ 438,065,000 |
Gross Profit: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Profit | 121,282,000 | 119,039,000 | 88,954,000 | 55,048,000 | 53,629,000 | 54,528,000 | 48,794,000 | 43,154,000 | 384,323,000 |  | 200,105,000 |  | 149,456,000 |
Operating Income (Loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  | 92,779,000 |  | 44,399,000 |  | 3,227,000 |
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 |  |  |  |  |  |  |  |  | 120,104,000 |  | 94,598,000 |  | 76,287,000 |
Gross Profit: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross Profit |  |  |  |  |  |  |  |  | 34,282,000 |  | 26,637,000 |  | 23,058,000 |
Operating Income (Loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  | 2,375,000 |  | (3,491,000) |  | (20,998,000) |
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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