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Intangible assets, net - Intangible Assets Other than Goodwill (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 111,264 $ 88,149
Accumulated amortization (12,733) (704)
Net intangible assets $ 98,531 $ 87,445
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  
Purchased IP and Capitalized Litigation Costs [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 10 years 10 years
Gross amount   $ 1,659
Accumulated amortization   (34)
Net intangible assets   1,625
Software Developed for Internal Use [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 11,438 2,571
Accumulated amortization (505) (50)
Net intangible assets $ 10,933 $ 2,521
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
Acquired Proprietary Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 5 years 5 years
Gross amount $ 13,532 $ 10,716
Accumulated amortization (2,660) (133)
Net intangible assets 10,872 10,583
Customer Relationship [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross amount 34,986 30,875
Accumulated amortization (4,840) (272)
Net intangible assets $ 30,146 $ 30,603
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]    
Estimated useful life of intangible assets 20 years 20 years
Gross amount $ 18,057 $ 16,357
Accumulated amortization (916) (50)
Net intangible assets $ 17,141 $ 16,307
Domain Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 20 years 20 years
Gross amount $ 191 $ 191
Accumulated amortization (10) (1)
Net intangible assets 181 190
Databases [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross amount 31,292 25,052
Accumulated amortization (3,354) (155)
Net intangible assets $ 27,938 $ 24,897
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 $ 728
Accumulated amortization (448) (9)
Net intangible assets $ 1,320 $ 719
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