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Summary of Significant Accounting Policies - Estimated Useful Life of Property, Plant and Equipment (Detail)	12 Months Ended
	Dec. 31, 2016
Land and Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, useful life	10 years
Rail Spur
Property Plant And Equipment [Line Items]
Property, plant and equipment, useful life	30 years
Deferred Mining Costs
Property Plant And Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Minimum | Plant and Building
Property Plant And Equipment [Line Items]
Property, plant and equipment, useful life	5 years
Minimum | Real Estate Properties
Property Plant And Equipment [Line Items]
Property, plant and equipment, useful life	10 years
Minimum | Vehicles
Property Plant And Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Minimum | Machinery, Equipment and Tooling
Property Plant And Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Minimum | Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Maximum | Plant and Building
Property Plant And Equipment [Line Items]
Property, plant and equipment, useful life	15 years
Maximum | Real Estate Properties
Property Plant And Equipment [Line Items]
Property, plant and equipment, useful life	40 years
Maximum | Vehicles
Property Plant And Equipment [Line Items]
Property, plant and equipment, useful life	5 years
Maximum | Machinery, Equipment and Tooling
Property Plant And Equipment [Line Items]
Property, plant and equipment, useful life	15 years
Maximum | Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property, plant and equipment, useful life	10 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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