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Intangible assets, net - Intangible Assets Other than Goodwill (Detail) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | $ 99,828 | $ 99,090
Accumulated amortization | (43,245) | (37,278)
Total | 56,583 | 61,812
Software developed for internal use |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | 3,775 | 3,037
Accumulated amortization | (1,425) | (1,282)
Total | $ 2,350 | 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 | (8,127) | (6,987)
Total | $ 3,332 | 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 | (16,810) | (14,417)
Total | $ 18,176 | 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 | (2,913) | (2,504)
Total | $ 13,444 | 13,853
Estimated useful life of intangible assets | 20 years |
Domain names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | $ 191 | 191
Accumulated amortization | (34) | (29)
Total | $ 157 | 162
Estimated useful life of intangible assets | 20 years |
Databases |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | $ 31,292 | 31,292
Accumulated amortization | (12,377) | (10,573)
Total | $ 18,915 | 20,719
Databases | Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life of intangible assets | 5 years |
Databases | 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 | (1,559) | (1,486)
Total | $ 209 | $ 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 |

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