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Net Pension Assets - Summary of Sensitivity Analysis for Actuarial Assumptions (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Discount rate [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Actuarial assumption rate	3.15%	3.37%	3.45%
Compensation - salary increase [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Actuarial assumption rate	4.00%	4.00%	4.00%
Mortality [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Demographic assumptions, Mortality	RP - 2000 no collar	RP - 2000 no collar	RP - 2000 no collar
Termination [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Actuarial assumption rate	13.00%	13.00%	13.00%
Male [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Retirement age	62	62	62
Female [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Retirement age	57	57	57

X

- Definition

Ratio of reasonably possible increase in actuarial assumption.

+ References

No definition available.

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- Definition

The retirement age used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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

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- Definition

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]]

+ References

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