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Summary of Significant Accounting Policies - Estimated Useful Lives of Assets (Detail)
 12 Months Ended
Dec. 31, 2017
Buildings [Member] | Bottom of range [Member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Estimated useful lives of assets 20 years
Buildings [Member] | Top of range [Member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Estimated useful lives of assets 30 years
Building improvement [Member] | Bottom of range [Member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Estimated useful lives of assets 5 years
Building improvement [Member] | Top of range [Member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Estimated useful lives of assets 20 years
Machinery and equipment [Member] | Bottom of range [Member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Estimated useful lives of assets 5 years
Machinery and equipment [Member] | Top of range [Member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Estimated useful lives of assets 15 years
Motor vehicles [Member] | Bottom of range [Member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Estimated useful lives of assets 3 years
Motor vehicles [Member] | Top of range [Member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Estimated useful lives of assets 10 years
Office equipment [Member] | Bottom of range [Member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Estimated useful lives of assets 3 years
Office equipment [Member] | Top of range [Member]  
Disclosure of detailed information about property, plant and equipment [Line Items]  
Estimated useful lives of assets 10 years