Goodwill - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Increase (decrease) in carrying amount of goodwill	$ 0	$ 0	$ 0
Goodwill impairment	0	$ 0	$ 0
Gross goodwill	$ 43,700,000
EWI Re, Inc.
Goodwill [Line Items]
Goodwill impairment				$ 6,400,000
CompX | Marine Components
Goodwill [Line Items]
Goodwill impairment				$ 10,100,000