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Defined benefit plans - Summary of Sensitivity of the Overall Pension Obligation to Changes in the Weighted Principal Assumptions (Detail)	Dec. 31, 2018 USD ($)
Discount rate [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Change in assumption, increase	0.50%
Change in assumption, decrease	0.50%
Impact on overall obligation, due to 0.5 % decrease in actuarial assumption	$ 2,189,000
Impact on overall obligation, due to 0.5 % increase in actuarial assumption	$ 2,401,000
Salary escalation rate [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Change in assumption, increase	0.50%
Change in assumption, decrease	0.50%
Impact on overall obligation, due to 0.5 % decrease in actuarial assumption	$ 0
Impact on overall obligation, due to 0.5 % increase in actuarial assumption	$ 0

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- Definition

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

+ References

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]]

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The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]]

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The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]]

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