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Acquisitions (Schedule of Purchase Price Allocation) (Details)
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2013
CyberCoders [Member]
USD ($)
Dec. 31, 2013
CyberCoders [Member]
USD ($)
Dec. 05, 2013
CyberCoders [Member]
USD ($)
Dec. 31, 2013
Whitaker [Member]
USD ($)
Dec. 31, 2013
Whitaker [Member]
USD ($)
Dec. 02, 2013
Whitaker [Member]
USD ($)
May 15, 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 ($)
Dec. 05, 2013
Contractor Relations [Member]
CyberCoders [Member]
USD ($)
Dec. 02, 2013
Contractor Relations [Member]
Whitaker [Member]
USD ($)
May 15, 2012
Contractor Relations [Member]
Apex Systems
USD ($)
Jul. 31, 2011
Contractor Relations [Member]
HCP
USD ($)
Feb. 28, 2011
Contractor Relations [Member]
Valesta
USD ($)
Dec. 05, 2013
Customer Relationships [Member]
CyberCoders [Member]
USD ($)
Dec. 02, 2013
Customer Relationships [Member]
Whitaker [Member]
USD ($)
May 15, 2012
Customer Relationships [Member]
Apex Systems
USD ($)
Jul. 31, 2011
Customer Relationships [Member]
HCP
USD ($)
Feb. 28, 2011
Customer Relationships [Member]
Valesta
USD ($)
Dec. 05, 2013
Noncompete Agreements [Member]
CyberCoders [Member]
USD ($)
Dec. 02, 2013
Noncompete Agreements [Member]
Whitaker [Member]
USD ($)
May 15, 2012
Noncompete Agreements [Member]
Apex Systems
USD ($)
Jul. 31, 2011
Noncompete Agreements [Member]
HCP
USD ($)
Feb. 28, 2011
Noncompete Agreements [Member]
Valesta
USD ($)
Dec. 05, 2013
Software [Member]
CyberCoders [Member]
USD ($)
Dec. 05, 2013
Trademarks [Member]
CyberCoders [Member]
USD ($)
Dec. 02, 2013
Trademarks [Member]
Whitaker [Member]
USD ($)
May 15, 2012
Trademarks [Member]
Apex Systems
USD ($)
Jul. 31, 2011
Trademarks [Member]
HCP
USD ($)
Feb. 28, 2011
Trademarks [Member]
Valesta
USD ($)
Business Acquisition [Line Items]                                                                          
Acquired Finite-lived Intangible Asset, Amount                                 $ 3,900,000 $ 1,800,000 $ 10,589,000 $ 814,000 $ 266,000 $ 750,000 $ 5,900,000 $ 92,147,000 $ 950,000 $ 2,395,000 $ 800,000 $ 60,000 $ 2,076,000 $ 20,000 $ 440,000 $ 18,900,000          
Acquired Indefinite-lived Intangible Asset, Amount                                                                 12,100,000 2,000,000 146,743,000 0 2,578,000
Business Acquisition, Effective Date of Acquisition     Dec. 05, 2013     Dec. 02, 2013     May 15, 2012     Jul. 31, 2011   Feb. 28, 2011 Feb. 28, 2011                                            
Business Acquisition, Name of Acquired Entity     CyberCoders Holdings, Inc     Whitaker Medical, LLC     Apex Systems, Inc.     HealthCare Partners, Inc. ("HCP")   Warphi N.V. and its subsidiaries (collectively, "Valesta") Warphi N.V. and its subsidiaries (collectively, "Valesta")                                            
Business Acquisition, Description of Acquired Entity     a privately-owned provider of permanent placement services headquartered in Irvine, California.     a privately-owned provider of physician staffing services headquartered in Houston, Texas.     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                                            
Business Combination, Reason for Business Combination     The primary reason for the acquisition was to expand the Company's permanent placement services.     The primary reason for the acquisition was to expand the Company's Physician staffing services.     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                                            
Business Combination, Consideration Transferred         98,600,000     21,300,000 610,800,000     19,100,000   23,700,000                                              
Current assets         10,805,000     8,909,000 172,042,000     3,950,000   6,332,000                                              
Property and equipment         3,790,000     272,000 902,000     123,000   299,000                                              
Goodwill, Acquired During Period 264,590,000     70,527,000     7,452,000                                                            
Goodwill         70,527,000     7,452,000 264,590,000     14,398,000   17,911,000                                              
Identifiable intangible assets         36,450,000     9,760,000 251,555,000     1,784,000   5,679,000                                              
Other         915,000     568,000 494,000     13,000   26,000                                              
Total assets acquired         122,487,000     26,961,000 689,583,000     20,268,000   30,247,000                                              
Current liabilities         8,022,000     5,083,000 77,905,000     1,070,000   4,774,000                                              
Other         15,817,000     551,000 850,000     49,000   1,814,000                                              
Total liabilities assumed         23,839,000     5,634,000 78,755,000     1,119,000   6,588,000                                              
Total purchase price         98,648,000     21,327,000 610,828,000     19,149,000   23,659,000                                              
Business Acquisition, Cost of Acquired Entity, Cash Paid         93,600,000     18,500,000 385,000,000   300,000 15,700,000   16,800,000                                              
Business Acquisition, Contingent Consideration, at Fair Value         5,000,000     2,800,000       3,400,000   6,900,000                                              
Business Acquisition, Contingent Consideration, Potential Cash Payment   16,000,000     11,000,000     5,000,000       3,700,000     5,000,000                                            
Business Combination, Acquisition Related Costs       1,500,000     400,000     9,800,000     57,000     400,000                                          
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount         10,300,000                                                                
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual     3,600,000     2,300,000                                                              
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual     $ (100,000)     $ (28,000)