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Intangible assets, net - Intangible Assets Other than Goodwill (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | $ 113,928 | $ 111,264
Accumulated amortization | (22,374) | (12,733)
Net intangible assets | 91,554 | 98,531
Software Developed for Internal Use [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | 17,945 | 11,438
Accumulated amortization | (1,312) | (505)
Net intangible assets | $ 16,633 | $ 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 | $ 11,381 | $ 13,532
Accumulated amortization | (4,124) | (2,660)
Net intangible assets | 7,257 | 10,872
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | 34,986 | 34,986
Accumulated amortization | (8,431) | (4,840)
Net intangible assets | $ 26,555 | $ 30,146
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 | $ 18,057
Accumulated amortization | (1,482) | (916)
Net intangible assets | $ 14,875 | $ 17,141
Domain Names [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life of intangible assets | 20 years | 20 years
Gross amount | $ 199 | $ 191
Accumulated amortization | (17) | (10)
Net intangible assets | 182 | 181
Databases [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | 31,292 | 31,292
Accumulated amortization | (6,061) | (3,354)
Net intangible assets | $ 25,231 | $ 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 | (947) | (448)
Net intangible assets | $ 821 | $ 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

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