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Employee Benefit - Sensitivity Analysis of One-percentage Point Change in Assumed Rates (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Discount rate [Member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Assumption - 1% increase	$ (721)	$ (588)
Assumption - 1% decrease	844	687
Rate of salary increase [Member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Assumption - 1% increase	808	661
Assumption - 1% decrease	$ (707)	$ (574)

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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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]]

+ References

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