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Acquisitions Acquisitions Costs, by Acquisition (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended
Jun. 05, 2015
Apr. 14, 2015
Sep. 30, 2015
Sep. 30, 2014
Jun. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Business Acquisition [Line Items]              
Write off of Deferred Debt Issuance Cost     $ 0 $ 0   $ 3,751 $ 0
Business Combination, Acquisition Related Costs           6,100  
Potential future earn-out obligations     41,000     41,000  
Stock Issued During Period, Value, Acquisitions         $ 30,200 $ 30,200  
Stock Issued During Period, Shares, Acquisitions         794,700 794,700  
Sales Revenue, Services, Net     572,123 442,443   $ 1,487,491 1,283,718
Operating Income (Loss)     $ 51,465 $ 38,698   109,246 $ 101,975
Creative Circle [Member]              
Business Acquisition [Line Items]              
BusinessCombinationRecognizedGoodwill $ 358,460            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 194,500            
Business Acquisition, Goodwill, Expected Tax Deductible Amount $ 348,900            
Business Combination, Acquisition Related Costs           5,700  
Business Acquisition, Effective Date of Acquisition Jun. 05, 2015            
Potential future earn-out obligations $ 30,000            
Business Acquisition, Name of Acquired Entity Creative Circle, LLC            
Business Acquisition, Description of Acquired Entity is headquartered in Los Angeles, California            
Business Combination, Consideration Transferred $ 540,900            
Business Combination, Consideration Transferred, Other $ 900            
Business Combination, Reason for Business Combination was purchased to expand the Company’s technical and creative staffing services            
Payments to Acquire Businesses, Gross $ 540,000            
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned 30,000            
Sales Revenue, Services, Net         $ 92,600    
Operating Income (Loss)         12,800    
LabResource [Member]              
Business Acquisition [Line Items]              
BusinessCombinationRecognizedGoodwill   $ 6,104          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   $ 7,528          
Business Combination, Acquisition Related Costs           $ 400  
Business Acquisition, Effective Date of Acquisition   Apr. 14, 2015          
Business Acquisition, Name of Acquired Entity   LabResource B.V.          
Business Acquisition, Description of Acquired Entity   headquartered in Amsterdam, Netherlands          
Business Combination, Reason for Business Combination   expand the Company's life sciences staffing business in Europe          
Payments to Acquire Businesses, Gross   $ 12,700          
Sales Revenue, Services, Net         4,900    
Operating Income (Loss)         $ 700    
Contractor Relations [Member]              
Business Acquisition [Line Items]              
Acquired Finite Lived Intangible Assets Average Useful Life           4 years  
Contractor Relations [Member] | Creative Circle [Member]              
Business Acquisition [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 29,500            
Contractor Relations [Member] | LabResource [Member]              
Business Acquisition [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   947          
Non-compete agreements | Creative Circle [Member]              
Business Acquisition [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 7,300            
Non-compete agreements | LabResource [Member]              
Business Acquisition [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   20          
Contract-Based Intangible Assets [Member]              
Business Acquisition [Line Items]              
Acquired Finite Lived Intangible Assets Average Useful Life           5 years  
Contract-Based Intangible Assets [Member] | Creative Circle [Member]              
Business Acquisition [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 900            
Contract-Based Intangible Assets [Member] | LabResource [Member]              
Business Acquisition [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   0          
Customer relations              
Business Acquisition [Line Items]              
Acquired Finite Lived Intangible Assets Average Useful Life           10 years  
Customer relations | Creative Circle [Member]              
Business Acquisition [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 90,700            
Customer relations | LabResource [Member]              
Business Acquisition [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   $ 5,421          
Maximum [Member] | Non-compete agreements              
Business Acquisition [Line Items]              
Acquired Finite Lived Intangible Assets Average Useful Life           6 years  
Minimum [Member] | Non-compete agreements              
Business Acquisition [Line Items]              
Acquired Finite Lived Intangible Assets Average Useful Life           2 years