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Other Income, Net - Additional Information (Detail) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 30, 2018 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) Parcel | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Disclosure Other Income Net Additional Information Detail [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends and interest income |  |  |  |  |  |  |  |  | $ 4,800 | $ 10,900 | $ 26,100
Gain on securities transaction recognized |  |  |  |  |  |  |  |  | (100) | 300 | 12,400
Insurance recoveries |  |  |  |  |  | $ 7,700 |  |  | 1,600 | 7,700 | 1,300
Number of land parcels | Parcel |  |  |  |  |  |  |  | 2 |  |  |
Net proceeds |  |  |  |  |  |  |  |  |  | 4,600 | 19,500
Pre-tax gain on sale of land |  | $ 4,000 |  |  |  |  |  | $ 11,900 |  |  |
Gain on sale of business |  |  |  | $ 3,000 |  |  |  |  | $ 4,900 | 3,000 | 58,400
Kronos Worldwide, Inc. |  |  |  |  |  |  |  |  |  |  |
Disclosure Other Income Net Additional Information Detail [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on insurance settlement related to property damage claim |  |  | $ 1,500 | 2,600 |  |  |  |  |  |  |
Tremont |  |  |  |  |  |  |  |  |  |  |
Disclosure Other Income Net Additional Information Detail [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net proceeds |  |  |  |  |  |  |  | 18,900 |  |  |
Tremont | Promissory Note |  |  |  |  |  |  |  |  |  |  |
Disclosure Other Income Net Additional Information Detail [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal payment of debt |  |  |  |  |  |  |  | $ 2,200 |  |  |
Amalgamated Sugar Company LLC |  |  |  |  |  |  |  |  |  |  |
Disclosure Other Income Net Additional Information Detail [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividends and interest income |  |  |  |  |  |  |  |  |  |  | 16,900
Snake River |  |  |  |  |  |  |  |  |  |  |
Disclosure Other Income Net Additional Information Detail [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on securities transaction recognized | $ 12,500 |  |  |  |  |  | $ 12,500 |  |  |  | 12,500
NL |  |  |  |  |  |  |  |  |  |  |
Disclosure Other Income Net Additional Information Detail [Line Items] |  |  |  |  |  |  |  |  |  |  |
Insurance recoveries |  |  |  |  |  |  |  |  |  | $ 5,100 |
Net proceeds |  |  |  |  | $ 4,600 |  |  |  |  |  | $ 600
Pre-tax gain on sale of land |  |  |  |  | $ 4,400 |  |  |  |  |  |
NL | Insurance and Risk Management Business |  |  |  |  |  |  |  |  |  |  |
Disclosure Other Income Net Additional Information Detail [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of business |  |  |  | 3,250 |  |  |  |  |  |  |
Gain on sale of business |  |  |  | $ 3,000 |  |  |  |  |  |  |

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