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Segment and Geographical Information - Geographical Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues $ 716,165 $ 692,623 $ 484,559
Total property and equipment, net 42,595 42,011 32,309
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues 617,268 591,566 403,375
Total property and equipment, net 34,899 36,497 29,506
Non-US      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenues 98,897 101,057 81,184
Total property and equipment, net $ 7,696 $ 5,514 $ 2,803