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Related Party Transactions - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Related Party Transaction [Line Items] |  |  |  |
Note receivable from affiliate | $ 13,200,000 | $ 18,700,000 |  |
Contran Corporation [Member] | 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 | 3,300,000 | 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 | 1,000,000.0 | 900,000 | 700,000 |
Unsecured Revolving Demand Promissory | Valhi Inc |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Maximum loan amount |  |  |  | $ 25,000,000
Interest rate on loans repayment |  |  |  | 1.00%
Principal due on demand effective date |  |  |  | Dec. 31, 2024
Note receivable from affiliate | 13,200,000 | 18,700,000 |  |
Interest income including unused commitment fees on our loan | $ 1,000,000.0 | $ 1,200,000 | $ 1,500,000 |

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- Definition Maximum lending capacity under the terms noted per the related party credit facility. + References No definition available. + Details
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- Definition Loans receivable principal due on demand effective date. + References No definition available. + Details
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- Definition Amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership, due after 1 year (or 1 business cycle). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6457730&loc=d3e39599-107864 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=124433192&loc=d3e56071-112765 Reference 3: 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(3)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 4: 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(10)(3)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-06(3)(a)(3)) -URI https://asc.fasb.org/extlink&oid=120401414&loc=d3e604059-122996 + Details
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- Definition Amount of interest income earned from interest-bearing assets owed to the entity by related party. + References No definition available. + Details
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- Definition Percentage added to reference rate used to compute variable rate on loan receivable. + References No definition available. + Details
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