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Accounts and Other Receivables, Net - Schedule of Accounts Notes Loans and Financing Receivable (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Receivables [Abstract]    
Other receivables $ 17 $ 393
Accrued insurance recoveries 34 18
Total 15,157 11,142
CompX    
Receivables [Abstract]    
Trade receivables 15,176 10,801
Allowance for doubtful accounts $ (70) $ (70)