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Intangible assets, net - Intangible Assets Other than Goodwill (Detail) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | $ 100,307 | $ 98,948
Accumulated amortization | (34,242) | (24,594)
Total | 66,065 | 74,354
Software Developed for Internal Use |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | 4,254 | 2,972
Accumulated amortization | (1,001) | (490)
Total | $ 3,253 | 2,482
Estimated useful life of intangible assets | 3 years |
Acquired Proprietary Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | $ 11,459 | 11,382
Accumulated amortization | (6,411) | (4,693)
Total | $ 5,048 | 6,689
Estimated useful life of intangible assets | 5 years |
Customer Relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | $ 34,986 | 34,986
Accumulated amortization | (13,220) | (9,628)
Total | $ 21,766 | 25,358
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 | (2,300) | (1,686)
Total | $ 14,057 | 14,671
Estimated useful life of intangible assets | 20 years |
Domain Names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | $ 191 | 191
Accumulated amortization | (27) | (20)
Total | $ 164 | 171
Estimated useful life of intangible assets | 20 years |
Database Rights |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | $ 31,292 | 31,292
Accumulated amortization | (9,670) | (6,964)
Total | $ 21,622 | 24,328
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 | (1,613) | (1,113)
Total | $ 155 | $ 655
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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