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Intangible assets, net - Intangible Assets Other than Goodwill (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | $ 99,090 | $ 98,948
Accumulated amortization | (37,278) | (24,594)
Net intangible assets | $ 61,812 | 74,354
Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life of intangible assets | 2 years |
Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life of intangible assets | 20 years |
Software developed for internal use |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | $ 3,037 | 2,972
Accumulated amortization | (1,282) | (490)
Net intangible assets | $ 1,755 | $ 2,482
Estimated useful life of intangible assets | 3 years | 3 years
Acquired proprietary technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | $ 11,459 | $ 11,382
Accumulated amortization | (6,987) | (4,693)
Net intangible assets | $ 4,472 | $ 6,689
Estimated useful life of intangible assets | 5 years | 5 years
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | $ 34,986 | $ 34,986
Accumulated amortization | (14,417) | (9,628)
Net intangible assets | $ 20,569 | $ 25,358
Customer relationships | Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life of intangible assets | 7 years | 7 years
Customer relationships | Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life of intangible assets | 10 years | 10 years
Trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | $ 16,357 | $ 16,357
Accumulated amortization | (2,504) | (1,686)
Net intangible assets | $ 13,853 | $ 14,671
Estimated useful life of intangible assets | 20 years | 20 years
Domain names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | $ 191 | $ 191
Accumulated amortization | (29) | (20)
Net intangible assets | $ 162 | $ 171
Estimated useful life of intangible assets | 20 years | 20 years
Databases |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | $ 31,292 | $ 31,292
Accumulated amortization | (10,573) | (6,964)
Net intangible assets | $ 20,719 | $ 24,328
Databases | Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life of intangible assets | 5 years | 5 years
Databases | Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life of intangible assets | 10 years | 10 years
Non-competition agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross amount | $ 1,768 | $ 1,768
Accumulated amortization | (1,486) | (1,113)
Net intangible assets | $ 282 | $ 655
Non-competition agreements | Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life of intangible assets | 2 years | 2 years
Non-competition agreements | Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Estimated useful life of intangible assets | 5 years | 5 years

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