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Net Pension Assets - Summary of Additional Information about Sensitivity Analysis for Actuarial Assumptions (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Discount rate (0.5% movement) [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase	$ (506)	$ (410)	$ (366)
Decrease	537	434	388
Compensation - salary increase [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase	99	122	114
Decrease	$ (89)	$ (117)	$ (109)

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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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