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Derivatives Hedges and Financial Instruments - Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Recurring - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Assets - Supplies, prepaid items and other:
Natural gas contracts		$ 80
Total		80
Liabilities - Current and noncurrent accrued and other liabilities:
Natural gas contracts		1,285
Embedded derivative	$ 1,465	1,029
Total	1,465	$ 2,314
Significant Unobservable Inputs (Level 3) [Member]
Liabilities - Current and noncurrent accrued and other liabilities:
Embedded derivative	1,465
Total	$ 1,465

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Fair value of natural gas contracts.

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959

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- Definition

Fair value of financial and nonfinancial obligations.

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-SubTopic 10
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