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v3.19.1

Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018
Land Improvements [Member] |
Disclosure of significant accounting policies [line items] |
Useful lives of property, plant and equipment | 20 years
Assets under finance leases [member] |
Disclosure of significant accounting policies [line items] |
Useful lives of property, plant and equipment | 20 years
Bottom of range [member] | Buildings [member] |
Disclosure of significant accounting policies [line items] |
Useful lives of property, plant and equipment | 10 years
Bottom of range [member] | Machinery and equipment [member] |
Disclosure of significant accounting policies [line items] |
Useful lives of property, plant and equipment | 2 years
Bottom of range [member] | Office equipment [member] |
Disclosure of significant accounting policies [line items] |
Useful lives of property, plant and equipment | 3 years
Top of range [member] | Buildings [member] |
Disclosure of significant accounting policies [line items] |
Useful lives of property, plant and equipment | 20 years
Top of range [member] | Machinery and equipment [member] |
Disclosure of significant accounting policies [line items] |
Useful lives of property, plant and equipment | 5 years
Top of range [member] | Office equipment [member] |
Disclosure of significant accounting policies [line items] |
Useful lives of property, plant and equipment | 5 years

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- Details
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