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Employee Benefit - Sensitivity Analysis of One-percentage Point Change in Assumed Rates (Parenthetical) (Detail)	Dec. 31, 2017	Dec. 31, 2016
Discount rate [Member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Rate increase	1.00%	1.00%
Rate decrease	1.00%	1.00%
Rate of salary increase [Member]
Disclosure of sensitivity analysis for actuarial assumptions [Line Items]
Rate increase	1.00%	1.00%
Rate decrease	1.00%	1.00%

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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.

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- Definition

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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- 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]]

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