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Commitments and Contingencies - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2019
Commitments And Contingencies Disclosure [Abstract] |  |
Letters of credit outstanding, amount | $ 4,300,000 | $ 4,300,000
Contingently liable for performance, current | 24,300,000 |
Outstanding guarantees | $ 0 |
Percentage of expected natural gas usage | 30.00% |

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- Definition Contingent liability for performance bonds required by states municipalities and related agencies. + References No definition available. + Details
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- Definition Percentage of expected natural gas usage. + References No definition available. + Details
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- Definition This item represents a non-contingent liability for the fair value of an obligation to stand ready to perform over the term of a guaranty issued in the event that specified triggering events or conditions occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121555860&loc=d3e11019-110243 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121555860&loc=d3e11049-110243 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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