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Intangible assets, net - Intangible Assets Other than Goodwill (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 99,178 $ 99,090
Accumulated amortization (40,119) (37,278)
Total 59,059 61,812
Software Developed for Internal Use    
Finite-Lived Intangible Assets [Line Items]    
Gross amount 3,125 3,037
Accumulated amortization (1,210) (1,282)
Total $ 1,915 1,755
Estimated useful life of intangible assets 3 years  
Acquired Proprietary Technology    
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 11,459 11,459
Accumulated amortization (7,558) (6,987)
Total $ 3,901 4,472
Estimated useful life of intangible assets 5 years  
Customer Relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 34,986 34,986
Accumulated amortization (15,613) (14,417)
Total $ 19,373 20,569
Customer Relationships | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 7 years  
Customer Relationships | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 10 years  
Trade Names    
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 16,357 16,357
Accumulated amortization (2,709) (2,504)
Total $ 13,648 13,853
Estimated useful life of intangible assets 20 years  
Domain Names    
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 191 191
Accumulated amortization (32) (29)
Total $ 159 162
Estimated useful life of intangible assets 20 years  
Database Rights    
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 31,292 31,292
Accumulated amortization (11,475) (10,573)
Total $ 19,817 20,719
Database Rights | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 5 years  
Database Rights | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 10 years  
Non-competition Agreements    
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 1,768 1,768
Accumulated amortization (1,522) (1,486)
Total $ 246 $ 282
Non-competition Agreements | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 2 years  
Non-competition Agreements | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 5 years