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Acquisitions Acquisitions Costs, by Acquisition (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 05, 2015
Apr. 14, 2015
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Business Acquisition [Line Items]          
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Payments     $ 0 $ 15,751 $ 0
Other Payments to Acquire Businesses       1,937 0
Payments of Merger Related Costs, Financing Activities       13,814 $ 0
Creative Circle [Member]          
Business Acquisition [Line Items]          
Business Acquisition, Effective Date of Acquisition Jun. 05, 2015        
Business Acquisition, Name of Acquired Entity Creative Circle, LLC        
Business Acquisition, Description of Acquired Entity is headquartered in Los Angeles, California        
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 30,200        
Stock Issued During Period, Shares, Acquisitions         794,700
Business Acquisition Contingent Consideration At Fair Value Accrued Earn-Out $ 13,800        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Payments       15,751  
Other Payments to Acquire Businesses       2,000  
Payments of Merger Related Costs, Financing Activities       $ 13,800  
Business Combination, Acquisition Related Costs         $ 5,700
LabResource [Member]          
Business Acquisition [Line Items]          
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      
Business Combination, Acquisition Related Costs         $ 400