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Significant Accounting Policies - Summary of Estimated Useful Lives of Property, Plant and Equipment (Detail)
 12 Months Ended
Dec. 31, 2017
Buildings [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated Useful Life 5 - 40 years
Structures [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated Useful Life 5 - 40 years
Machinery and equipment1 [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated Useful Life 2 - 40 years
Vehicles [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated Useful Life 4 - 6 years
Tools [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated Useful Life 4 - 6 years
Office equipment [member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated Useful Life 2 - 6 years