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Net employee defined benefit - Summary of Additional Information about Sensitivity Analysis for Actuarial Assumptions (Detail) - Discount rate (0.5% movement) [member] - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of sensitivity analysis for actuarial assumptions [line items]      
Increase $ 2,318 $ 709 $ 538
Decrease $ (2,554) $ (751) $ (569)