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Intangible assets, net - Intangible Assets Other than Goodwill (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Finite Lived Intangible Assets [Line Items]    
Gross amount $ 115,590 $ 111,264
Accumulated amortization (25,883) (12,733)
Net intangible assets $ 89,707 98,531
Minimum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 2 years  
Maximum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 20 years  
Software Developed for Internal Use [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross amount $ 19,614 11,438
Accumulated amortization (1,779) (505)
Net intangible assets $ 17,835 $ 10,933
Software Developed for Internal Use [Member] | Minimum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 3 years 3 years
Software Developed for Internal Use [Member] | Maximum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 10 years 10 years
Proprietary Technology [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross amount $ 11,382 $ 13,532
Accumulated amortization (4,693) (2,660)
Net intangible assets $ 6,689 $ 10,872
Estimated useful life of intangible assets 5 years 5 years
Customer Relationship [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross amount $ 34,986 $ 34,986
Accumulated amortization (9,628) (4,840)
Net intangible assets $ 25,358 $ 30,146
Customer Relationship [Member] | Minimum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 7 years 7 years
Customer Relationship [Member] | Maximum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 10 years 10 years
Trade Names [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross amount $ 16,357 $ 18,057
Accumulated amortization (1,686) (916)
Net intangible assets $ 14,671 $ 17,141
Estimated useful life of intangible assets 20 years 20 years
Domain Names [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross amount $ 191 $ 191
Accumulated amortization (20) (10)
Net intangible assets $ 171 $ 181
Estimated useful life of intangible assets 20 years 20 years
Databases [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross amount $ 31,292 $ 31,292
Accumulated amortization (6,964) (3,354)
Net intangible assets $ 24,328 $ 27,938
Databases [Member] | Minimum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 5 years 5 years
Databases [Member] | Maximum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 10 years 10 years
Non-competition Agreements [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross amount $ 1,768 $ 1,768
Accumulated amortization (1,113) (448)
Net intangible assets $ 655 $ 1,320
Non-competition Agreements [Member] | Minimum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 2 years 2 years
Non-competition Agreements [Member] | Maximum [Member]    
Finite Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 5 years 5 years