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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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The amount of a present economic resource controlled by the entity as a result of past events. Economic resource is a right that has the potential to produce economic benefits.

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The amount of transfers out of Level 1 and into Level 2 of the fair value hierarchy of assets held at the end of the reporting period. [Refer: Level 1 of fair value hierarchy [member]; Level 2 of fair value hierarchy [member]]

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The amount of transfers out of Level 1 and into Level 2 of the fair value hierarchy of liabilities held at the end of the reporting period. [Refer: Level 1 of fair value hierarchy [member]; Level 2 of fair value hierarchy [member]]

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