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Segment Information and Geographic Data - Revenues by Geographical Region (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting Information [Line Items]    
Total Revenues $ 114,556 $ 82,252
Americas [Member]    
Segment Reporting Information [Line Items]    
Total Revenues 82,158 64,352
Europe [Member]    
Segment Reporting Information [Line Items]    
Total Revenues 25,209 13,844
Asia Pacific [Member]    
Segment Reporting Information [Line Items]    
Total Revenues $ 7,189 $ 4,056
Revenue [Member] | Outside Of Americas [Member] | Geographic Concentration Risk [Member]    
Segment Reporting Information [Line Items]    
Percentage of revenues generated outside of the Americas 28.00% 22.00%