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Summary of Significant Accounting Policies - Estimated useful life of Property, Plant, and Equipment (Detail)	12 Months Ended
	Dec. 31, 2017
Building [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful life	40 years
Minimum [Member] | Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful life	5 years
Minimum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful life	3 years
Minimum [Member] | Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful life	3 years
Maximum [Member] | Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful life	14 years
Maximum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful life	8 years
Maximum [Member] | Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, estimated useful life	6 years

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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- Details

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