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Acquisitions (Acquisitions Costs, by Acquisition) (Details) Share data in Millions, unless otherwise specified |  | 0 Months Ended | 8 Months Ended | 12 Months Ended |  | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended |  | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended
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Dec. 31, 2012 USD ($) | May 15, 2012 Apex Systems USD ($) | Dec. 31, 2012 Apex Systems USD ($) | Dec. 31, 2012 Apex Systems USD ($) | Sep. 30, 2012 Apex Systems USD ($) | Jul. 31, 2011 HCP USD ($) | Dec. 31, 2011 HCP USD ($) | Feb. 28, 2011 Valesta USD ($) | Feb. 28, 2011 Valesta EUR (€) | Dec. 31, 2011 Valesta USD ($) | Dec. 31, 2012 Valesta USD ($) | Jul. 19, 2010 Sharpstream USD ($) | Dec. 31, 2010 Sharpstream USD ($) | Apr. 16, 2010 Cambridge [Member] USD ($) | Dec. 31, 2010 Cambridge [Member] USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective Date of Acquisition |  | May 15, 2012 |  |  |  | Jul. 31, 2011 |  | Feb. 28, 2011 | Feb. 28, 2011 |  |  | Jul. 19, 2010 |  | Apr. 16, 2010 |
Name of Acquired Entity |  | Apex Systems, Inc. |  |  |  | HealthCare Partners, Inc. (HCP) |  | Warphi N.V. and its subsidiaries (collectively, Valesta) | Warphi N.V. and its subsidiaries (collectively, Valesta) |  |  | Sharpstream Holdings Limited (Sharpstream) |  | The Cambridge Group Ltd. and Cambridge Contract Staffing Group, Inc. (Cambridge) |
Description of Acquired Entity |  | a privately-owned provider of information technology staffing headquartered in Richmond, Virginia. |  |  |  | a privately-owned provider of physician staffing headquartered in Atlanta, Georgia |  | a privately-owned provider of specialized clinical research staffing headquartered in Belgium | a privately-owned provider of specialized clinical research staffing headquartered in Belgium |  |  | a privately-owned provider of search services for executives to middle managers in the life sciences sector |  | a Connecticut-based privately-held provider of specialized staffing services |
Reason for Business Combination |  | The primary reason for the acquisition was to expand the Company's information technology staffing services. |  |  |  | The primary reasons for the acquisition were to expand the Physician segment business operations geographic coverage and to leverage the Company’s infrastructure. |  | The primary reasons for the acquisition were to expand the Life Sciences business operations and to leverage the Company’s infrastructure | The primary reasons for the acquisition were to expand the Life Sciences business operations and to leverage the Company’s infrastructure |  |  | The primary reasons for the Sharpstream acquisition were to expand our Life Sciences business operations, further expand our global presence and to leverage the Company’s infrastructure. |  | The primary reasons for the Cambridge acquisition were to expand our Life Sciences, Oxford, and Physician business operations and to leverage the Company’s infrastructure. |
Purchase price |  | $ 610,800,000 |  |  |  | $ 19,100,000 |  | $ 23,700,000 |  |  |  | $ 8,600,000 |  | $ 7,600,000 |
Cost of acquired entity, cash paid |  | 385,000,000 |  |  | 300,000 | 15,700,000 |  | 16,800,000 |  |  |  | 7,200,000 |  | 5,300,000 |
Shares of Company's common stock issued (in shares) |  | 14.3 |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition costs expensed |  |  |  | 9,800,000 |  |  | 57,000 |  |  | 400,000 |  |  | 100,000 |  | 100,000
Revenues of acquiree included in statement of operations |  |  | 508,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Net loss of acquiree included in statement of operations |  |  | (7,300,000) |  |  |  |  |  |  |  |  |  |  |  |
Potential future earn-out consideration |  |  |  |  |  | 3,400,000 |  | 6,900,000 |  |  |  | 1,400,000 |  | 2,300,000 |
Maximum earn-out capped | $ 9,100,000 |  |  |  |  | $ 3,700,000 |  |  | € 5,000,000 |  | $ 6,600,000 |  |  |  |

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