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Fair value measurement - Additional information (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of fair value measurement [Line Items] |  |  |
Transfer of assets between level 1 to level2 | $ 0 |  |
Transfers of assets between Level 2 to Level 1 | 0 |  |
Transfer of liabilities between level 1 to level2 | 0 |  |
Transfers of liabilities between Level 2 to Level 1 | 0 |  |
Assets | 3,979,617 | $ 4,107,274 | $ 4,217,221
Investment property [member] |  |  |
Disclosure of fair value measurement [Line Items] |  |  |
Assets | $ 842,000 | $ 544,000 |

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