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Basis of Preparation of Financial Statements and Principal Accounting Policies - Estimated Useful Life for Depreciation of Individual Assets (Detail)
 12 Months Ended
Dec. 31, 2019
Buildings [member] | Bottom of range [member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Estimated useful life of individual assets 5 years
Buildings [member] | Top of range [member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Estimated useful life of individual assets 51 years
Machinery and equipment [member] | Bottom of range [member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Estimated useful life of individual assets 2 years
Machinery and equipment [member] | Top of range [member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Estimated useful life of individual assets 8 years
Tools [member] | Bottom of range [member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Estimated useful life of individual assets 2 years
Tools [member] | Top of range [member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Estimated useful life of individual assets 4 years
Other equipment [member] | Bottom of range [member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Estimated useful life of individual assets 2 years
Other equipment [member] | Top of range [member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Estimated useful life of individual assets 6 years