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Intangible assets, net - Intangible Assets Other than Goodwill (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 99,090 $ 98,948
Accumulated amortization (37,278) (24,594)
Net intangible assets $ 61,812 74,354
Minimum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 2 years  
Maximum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 20 years  
Software developed for internal use    
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 3,037 2,972
Accumulated amortization (1,282) (490)
Net intangible assets $ 1,755 $ 2,482
Estimated useful life of intangible assets 3 years 3 years
Acquired proprietary technology    
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 11,459 $ 11,382
Accumulated amortization (6,987) (4,693)
Net intangible assets $ 4,472 $ 6,689
Estimated useful life of intangible assets 5 years 5 years
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 34,986 $ 34,986
Accumulated amortization (14,417) (9,628)
Net intangible assets $ 20,569 $ 25,358
Customer relationships | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 7 years 7 years
Customer relationships | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 10 years 10 years
Trade names    
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 16,357 $ 16,357
Accumulated amortization (2,504) (1,686)
Net intangible assets $ 13,853 $ 14,671
Estimated useful life of intangible assets 20 years 20 years
Domain names    
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 191 $ 191
Accumulated amortization (29) (20)
Net intangible assets $ 162 $ 171
Estimated useful life of intangible assets 20 years 20 years
Databases    
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 31,292 $ 31,292
Accumulated amortization (10,573) (6,964)
Net intangible assets $ 20,719 $ 24,328
Databases | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 5 years 5 years
Databases | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 10 years 10 years
Non-competition agreements    
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 1,768 $ 1,768
Accumulated amortization (1,486) (1,113)
Net intangible assets $ 282 $ 655
Non-competition agreements | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 2 years 2 years
Non-competition agreements | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 5 years 5 years