Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule Of Significant Accounting Policies [Line Items]
Defined contribution plan expense	$ 3.9	$ 3.9	$ 3.7
Income tax payments to NL	$ 7.3	$ 7.8	$ 4.7
Minimum | Building
Schedule Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	15 years
Minimum | Equipment and software
Schedule Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	3 years
Maximum | Building
Schedule Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	40 years
Maximum | Equipment and software
Schedule Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	20 years
N L Industries [Member] | Comp X International Inc [Member]
Schedule Of Significant Accounting Policies [Line Items]
Percentage of ownership held by parent company	87.00%
Valhi Inc [Member] | N L Industries [Member]
Schedule Of Significant Accounting Policies [Line Items]
Percentage of ownership held by parent company	83.00%
Contran Corporation [Member] | Valhi Inc [Member]
Schedule Of Significant Accounting Policies [Line Items]
Percentage of ownership held by parent company	91.00%