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Intangible assets, net - Intangible Assets Other than Goodwill (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | $ 99,747 | $ 98,948
Accumulated amortization | (31,019) | (24,594)
Net intangible assets | $ 68,728 | $ 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 | $ 3,737 | $ 2,972
Accumulated amortization | (826) | (490)
Net intangible assets | $ 2,911 | $ 2,482
Acquired Proprietary Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life of intangible assets | 5 years | 5 years
Gross amount | $ 11,416 | $ 11,382
Accumulated amortization | (5,837) | (4,693)
Net intangible assets | 5,579 | 6,689
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | 34,986 | 34,986
Accumulated amortization | (12,023) | (9,628)
Net intangible assets | $ 22,963 | $ 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 | (2,095) | (1,686)
Net intangible assets | $ 14,262 | $ 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 | (24) | (20)
Net intangible assets | 167 | 171
Databases [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | 31,292 | 31,292
Accumulated amortization | (8,768) | (6,964)
Net intangible assets | $ 22,524 | $ 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 | (1,446) | (1,113)
Net intangible assets | $ 322 | $ 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

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