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Business combinations (Details) $ in Thousands, $ in Millions, ₩ in Billions | Aug. 21, 2020 USD ($) | Aug. 21, 2020 KRW (₩) | Feb. 28, 2020 USD ($) | Feb. 28, 2020 AUD ($) | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Aug. 21, 2020 KRW (₩) | Feb. 28, 2020 AUD ($)
--- | --- | --- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 595,927 | $ 593,129 |  |
InjuryNet |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  | 100.00% |  |  |  |  | 100.00%
Cash payment to acquire business |  |  | $ 4,400 | $ 6.7 |  |  |  |
Contingent consideration |  |  | 2,100 |  |  |  |  | $ 3.1
Goodwill |  |  | 2,600 |  |  |  |  |
Intangible assets |  |  | $ 900 |  |  |  |  |
Index Root |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired | 100.00% |  |  |  |  |  | 100.00% |
Cash payment to acquire business | $ 5,400 | ₩ 6.3 |  |  |  |  |  |
Contingent consideration | 900 |  |  |  |  |  | ₩ 1.1 |
Goodwill | 4,600 |  |  |  |  |  |  |
Intangible assets | $ 1,400 |  |  |  |  |  |  |

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