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Income Taxes - Summary of Temporary Differences in Deferred Income Tax Assets and Liabilities (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2020
Deferred tax assets and liabilities [abstract]
Mineral reserves useful life, years	35 years

X

- Definition

Intangible Asset Useful Life Years.

+ References

No definition available.

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Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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