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Additional Information of Expenses by Nature - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Top of range [member] | Compensation to Directors [member]
Expense by nature [line items]
Profit sharing bonus, percentage	0.30%	0.30%	0.30%
Bottom of range [member] | Bonus to Employees [member]
Expense by nature [line items]
Profit sharing bonus, percentage	1.00%	1.00%	1.00%

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose the amount of expenses aggregated according to their nature (for example, depreciation, purchases of materials, transport costs, employee benefits and advertising costs), and not reallocated among functions within the entity.

+ References

No definition available.

+ Details

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- Definition

Profit sharing bonus percentage.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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