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Commitments and Contingencies - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Commitments And Contingencies [Line Items] |  |  |
Purchase commitments for property, plant and equipment | $ 296,400,000 |  |
Asset retirement obligation depreciation and accretion | 11,900,000 | $ 14,500,000 | $ 9,100,000
Liability reserve for insurance claims | 42,000,000.0 | 37,700,000 |
Outstanding letters of credit | 17,200,000 |  |
Surety bonds | 419,700,000 |  |
Due from affiliate | 4,800,000 |  |
Guarantee of affiliate's obligations | 12,500,000 |  |
Capital expenditures | $ 99,000,000.0 | 77,000,000.0 | $ 106,700,000
Percentage of employees represented in labor union | 14.00% |  |
Woodville |  |  |
Commitments And Contingencies [Line Items] |  |  |
Collective bargaining agreement expiration month year | 2022-06 |  |
Magnesia Specialties |  |  |
Commitments And Contingencies [Line Items] |  |  |
Collective bargaining agreement expiration month year | 2027-08 |  |
Interest-only loan |  |  |
Commitments And Contingencies [Line Items] |  |  |
Due from affiliate | $ 6,000,000.0 | $ 6,000,000.0 |
Maturity date | Dec. 31, 2022 | Dec. 31, 2022 |
Revolving Line Of Credit Expires In August 2015 |  |  |
Commitments And Contingencies [Line Items] |  |  |
Line of credit maturity period | 2022-03 |  |
Revolving Facility |  |  |
Commitments And Contingencies [Line Items] |  |  |
Outstanding letters of credit | $ 2,600,000 | $ 2,600,000 |
Capital Addition Purchase Commitments |  |  |
Commitments And Contingencies [Line Items] |  |  |
Purchase commitments for property, plant and equipment | 101,700,000 |  |
Energy And Service Contracts |  |  |
Commitments And Contingencies [Line Items] |  |  |
Purchase commitments for property, plant and equipment | $ 194,700,000 |  |

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