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Intangible assets, net - Intangible Assets Other than Goodwill (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Gross amount $ 108,798 $ 88,149
Accumulated amortization (9,379) (704)
Net intangible assets $ 99,419 $ 87,445
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 $ 8,972 2,571
Accumulated amortization (321) (50)
Net intangible assets $ 8,651 $ 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 (1,983) (133)
Net intangible assets 11,549 10,583
Customer Relationship [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross amount 34,986 30,875
Accumulated amortization (3,643) (272)
Net intangible assets $ 31,343 $ 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 (691) (50)
Net intangible assets $ 17,366 $ 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 (8) (1)
Net intangible assets 183 190
Acquired Databases [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross amount 31,292 25,052
Accumulated amortization (2,452) (155)
Net intangible assets $ 28,840 $ 24,897
Acquired Databases [Member] | Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life of intangible assets 5 years 5 years
Acquired 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 (281) (9)
Net intangible assets $ 1,487 $ 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