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Acquisitions (Acquisitions Costs, by Acquisition) (Details) Share data in Millions, unless otherwise specified | 9 Months Ended | 0 Months Ended | 5 Months Ended | 9 Months Ended | 0 Months Ended | 12 Months Ended |  |  | 0 Months Ended | 12 Months Ended |
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Sep. 30, 2012 USD ($) | May 15, 2012 Apex Systems USD ($) | Sep. 30, 2012 Apex Systems USD ($) | Sep. 30, 2012 Apex Systems USD ($) | Feb. 28, 2011 Valesta USD ($) | Dec. 31, 2011 Valesta USD ($) | Sep. 30, 2012 Valesta Maximum USD ($) | Feb. 28, 2011 Valesta Maximum EUR (€) | Jul. 31, 2011 HCP USD ($) | Dec. 31, 2011 HCP USD ($) | Jul. 31, 2011 HCP Maximum USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effective Date of Acquisition |  | May 15, 2012 |  |  | Feb. 28, 2011 |  |  |  | Jul. 31, 2011 |  |
Name of Acquired Entity |  | Apex Systems, Inc. |  |  | Valesta |  |  |  | HealthCare Partners |  |
Description of Acquired Entity |  | a privately-owned provider of information technology staffing and services headquartered in Richmond, Virginia |  |  | a privately-owned provider of specialized clinical research staffing headquartered in Belgium |  |  |  | a privately-owned provider of physician staffing headquartered in Atlanta, Georgia |  |
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 Life Sciences business operations and to leverage the Company’s infrastructure. |  |  |  | The primary reasons for the acquisition were to expand the Physician segment business operations geographic coverage and to leverage the Company’s infrastructure. |  |
Cost of acquired entity, purchase price |  | $ 610,800,000 |  |  | $ 23,700,000 |  |  |  | $ 19,100,000 |  |
Cost of acquired entity, cash paid |  | 385,000,000 | 300,000 | 300,000 | 16,800,000 |  |  |  | 15,700,000 |  |
Shares of Company's common stock issued (in shares) |  | 14.3 |  |  |  |  |  |  |  |  |
Acquisition costs expensed |  |  |  | 9,400,000 |  | 400,000 |  |  |  | 57,000 |
Revenues of acquiree included in statement of operations |  |  | 301,200,000 |  |  |  |  |  |  |  |
Net loss of acquiree included in statement of operations |  |  | (900,000) |  |  |  |  |  |  |  |
Potential future earn-out consideration |  |  |  |  | 6,900,000 |  |  |  | 3,400,000 |  |
Maximum earn-out capped | $ 10,100,000 |  |  |  |  |  | $ 6,400,000 | € 5,000,000 |  |  | $ 3,700,000
Purchase Price Allocation, Methodology | Assets and liabilities of the acquired companies were recorded at their estimated fair values at the dates of acquisition. The excess purchase price over the fair value of net tangible assets and identifiable intangible assets acquired has been allocated to goodwill |  |  |  |  |  |  |  |  |  |
Purchase Price Allocation, Status |  | The Company's allocation of the purchase price for Apex is preliminary, as the valuation of net working capital, pre-acquisition contingencies, income taxes, long-term liabilities, identifiable intangible assets and goodwill are still being finalized. Any material measurement period adjustments will be recorded retrospectively to the acquisition date. |  |  |  |  |  |  |  |  |

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