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Lease Arrangements - Summary of the Group's Lease Liabilities are Mainly From Land and Buildings and Improvements. Range of Discount Rate for Lease Liabilities (Detail)
Dec. 31, 2019
Land [member] | Bottom of range [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Discount Rate For Lease Liabilities 0.54%
Land [member] | Top of range [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Discount Rate For Lease Liabilities 4.90%
Buildings and improvements [member] | Bottom of range [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Discount Rate For Lease Liabilities 0.30%
Buildings and improvements [member] | Top of range [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Discount Rate For Lease Liabilities 8.62%