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Intangible assets, net - Intangible Assets Other than Goodwill (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 100,307 $ 98,948
Accumulated amortization (34,242) (24,594)
Total 66,065 74,354
Software Developed for Internal Use    
Finite-Lived Intangible Assets [Line Items]    
Gross amount 4,254 2,972
Accumulated amortization (1,001) (490)
Total $ 3,253 2,482
Estimated useful life of intangible assets 3 years  
Acquired Proprietary Technology    
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 11,459 11,382
Accumulated amortization (6,411) (4,693)
Total $ 5,048 6,689
Estimated useful life of intangible assets 5 years  
Customer Relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 34,986 34,986
Accumulated amortization (13,220) (9,628)
Total $ 21,766 25,358
Customer Relationships | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 7 years  
Customer Relationships | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 10 years  
Trade Names    
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 16,357 16,357
Accumulated amortization (2,300) (1,686)
Total $ 14,057 14,671
Estimated useful life of intangible assets 20 years  
Domain Names    
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 191 191
Accumulated amortization (27) (20)
Total $ 164 171
Estimated useful life of intangible assets 20 years  
Database Rights    
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 31,292 31,292
Accumulated amortization (9,670) (6,964)
Total $ 21,622 24,328
Database Rights | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 5 years  
Database Rights | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 10 years  
Non-competition Agreements    
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 1,768 1,768
Accumulated amortization (1,613) (1,113)
Total $ 155 $ 655
Non-competition Agreements | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 2 years  
Non-competition Agreements | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 5 years