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Intangible assets, net - Intangible Assets Other than Goodwill (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 99,284 $ 98,948
Accumulated amortization (27,802) (24,594)
Net intangible assets $ 71,482 $ 74,354
Software Developed for Internal Use [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 3 years 3 years
Gross amount $ 3,308 $ 2,972
Accumulated amortization (655) (490)
Net intangible assets $ 2,653 $ 2,482
Acquired Proprietary Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 5 years 5 years
Gross amount $ 11,382 $ 11,382
Accumulated amortization (5,263) (4,693)
Net intangible assets 6,119 6,689
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross amount 34,986 34,986
Accumulated amortization (10,825) (9,628)
Net intangible assets $ 24,161 $ 25,358
Customer Relationships [Member] | Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 7 years 7 years
Customer Relationships [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 $ 16,357
Accumulated amortization (1,891) (1,686)
Net intangible assets $ 14,466 $ 14,671
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 (22) (20)
Net intangible assets 169 171
Databases [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross amount 31,292 31,292
Accumulated amortization (7,866) (6,964)
Net intangible assets $ 23,426 $ 24,328
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 (1,280) (1,113)
Net intangible assets $ 488 $ 655
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