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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2018
Revenue From Contract With Customer [Abstract]  
Schedule of Gross Billings Based on Billing of Clients Affiliates

Gross Billings, based on the billing address of the clients or client affiliates, were as follows (in thousands):

 

 

 

Three Months Ended

 

 

Nine Months Ended

 

 

 

September 30,

 

 

September 30,

 

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

US

 

$

479,489

 

 

$

337,134

 

 

$

1,282,178

 

 

$

843,557

 

International

 

 

89,255

 

 

 

59,370

 

 

 

242,519

 

 

 

146,286

 

Total

 

$

568,744

 

 

$

396,504

 

 

$

1,524,697

 

 

$

989,843