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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 |

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