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Summary of Significant Accounting Policies - Estimated Useful Lives of Assets (Detail) | 12 Months Ended
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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

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- Definition Method of measuring useful life of mine development costs. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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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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- Details
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- Details
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- Details
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- Details
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Data Type: | na
Balance Type: |
Period Type: |