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Lease Arrangements - Ranges Of Discount Rates For Lease Liabilities (Detail)
Dec. 31, 2019
Land [member] | Bottom of range [member]  
Disclosure Of Discount Rate On Lease Liabilities [Line Items]  
Discount rate on lease liabilities 0.67%
Land [member] | Top of range [member]  
Disclosure Of Discount Rate On Lease Liabilities [Line Items]  
Discount rate on lease liabilities 2.14%
Buildings [member] | Bottom of range [member]  
Disclosure Of Discount Rate On Lease Liabilities [Line Items]  
Discount rate on lease liabilities 0.67%
Buildings [member] | Top of range [member]  
Disclosure Of Discount Rate On Lease Liabilities [Line Items]  
Discount rate on lease liabilities 3.88%
Machinery [member]  
Disclosure Of Discount Rate On Lease Liabilities [Line Items]  
Discount rate on lease liabilities 3.24%
Office equipment [member] | Bottom of range [member]  
Disclosure Of Discount Rate On Lease Liabilities [Line Items]  
Discount rate on lease liabilities 0.64%
Office equipment [member] | Top of range [member]  
Disclosure Of Discount Rate On Lease Liabilities [Line Items]  
Discount rate on lease liabilities 3.88%