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Related Party Transactions - Additional Information (Detail) - USD ($) | 11 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Related Party Transaction [Line Items] |  |  |  |  |
Note receivable from affiliate |  | $ 18,700,000 | $ 29,500,000 |  |
Contran Corporation | Intercorporate Services Agreements Fees |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction expense |  | 3,400,000 | 3,400,000 | $ 3,400,000 |
Tall Pines Insurance Company or EWI RE Inc |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction expense | $ 2,300,000 | 2,900,000 | 2,800,000 |  |
Tall Pines Insurance Company or EWI RE Inc | Policies Written by Tall Pines Insurance Company |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction expense |  | 900,000 | 700,000 |  |
Unsecured Revolving Demand Promissory | Valhi Inc |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Maximum loan amount |  |  |  |  | $ 30,000,000
Interest rate on loans repayment |  |  |  |  | 1.00%
Principal due on demand effective date |  |  |  |  | Dec. 31, 2023
Note receivable from affiliate |  | 18,700,000 | 29,500,000 |  |
Interest income including unused commitment fees on our loan |  | $ 1,200,000 | $ 1,500,000 | $ 2,400,000 |

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