Other Noncurrent Liabilities - Additional Information (Detail) $ in Millions	1 Months Ended
Sep. 30, 2020 USD ($)
Nevada Environmental Response Trust
Line Of Credit Facility [Line Items]
Repayment of deferred payment obligation	$ 1.2

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.

No definition available.

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Period Type:	duration