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Acquisitions Schedule of Intangible Assets Acquired as Part of Business Combination (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Jun. 05, 2015
Contract-Based Intangible Assets [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired Finite Lived Intangible Assets Average Useful Life 5 years  
Creative Circle [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   $ 194,500
Business Acquisition, Goodwill, Expected Tax Deductible Amount   358,000
Creative Circle [Member] | Trademarks [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   66,100
Creative Circle [Member] | Contractor Relations [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   29,500
Creative Circle [Member] | Customer Relationships [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   90,700
Creative Circle [Member] | Noncompete Agreements [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   7,300
Creative Circle [Member] | Contract-Based Intangible Assets [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   $ 900
Minimum [Member] | Contractor Relations [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired Finite Lived Intangible Assets Average Useful Life 2 years  
Minimum [Member] | Customer Relationships [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired Finite Lived Intangible Assets Average Useful Life 2 years  
Minimum [Member] | Noncompete Agreements [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired Finite Lived Intangible Assets Average Useful Life 2 years  
Maximum [Member] | Contractor Relations [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired Finite Lived Intangible Assets Average Useful Life 4 years  
Maximum [Member] | Customer Relationships [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired Finite Lived Intangible Assets Average Useful Life 10 years  
Maximum [Member] | Noncompete Agreements [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Acquired Finite Lived Intangible Assets Average Useful Life 6 years