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v3.19.1

Income Taxes - Summary of Temporary Differences in Deferred Income Tax Assets and Liabilities (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2018
Deferred tax assets and liabilities [abstract] |
Mineral reserves useful life, years | 35 years

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- Definition Intangible Asset Useful Life Years. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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