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Intangible assets, net - Intangible Assets Other than Goodwill (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 109,738 $ 111,264
Accumulated amortization (15,709) (12,733)
Net intangible assets 94,029 98,531
Software Developed for Internal Use [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross amount 13,762 11,438
Accumulated amortization (729) (505)
Net intangible assets $ 13,033 $ 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
Acquired Proprietary Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 5 years 5 years
Gross amount $ 11,382 $ 13,532
Accumulated amortization (2,986) (2,660)
Net intangible assets 8,396 10,872
Customer Relationship [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross amount 34,986 34,986
Accumulated amortization (6,037) (4,840)
Net intangible assets $ 28,949 $ 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]    
Estimated useful life of intangible assets 20 years 20 years
Gross amount $ 16,357 $ 18,057
Accumulated amortization (1,073) (916)
Net intangible assets $ 15,284 $ 17,141
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 (13) (10)
Net intangible assets 178 181
Databases [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross amount 31,292 31,292
Accumulated amortization (4,257) (3,354)
Net intangible assets $ 27,035 $ 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 (614) (448)
Net intangible assets $ 1,154 $ 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