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Summary of Significant Accounting Policies - Estimated Useful Lives of Assets (Detail)	12 Months Ended
	Dec. 31, 2016
Buildings and improvements | Minimum
Property Plant And Equipment [Line Items]
Property plant and equipment useful life	10 years
Buildings and improvements | Maximum
Property Plant And Equipment [Line Items]
Property plant and equipment useful life	40 years
Machinery and equipment | Minimum
Property Plant And Equipment [Line Items]
Property plant and equipment useful life	3 years
Machinery and equipment | Maximum
Property Plant And Equipment [Line Items]
Property plant and equipment useful life	20 years
Mine development costs
Property Plant And Equipment [Line Items]
Mine development costs	units-of-production

X

- Definition

Method of measuring useful life of mine development costs.

+ References

No definition available.

+ Details

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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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X

- 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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- Details

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X

- Details

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