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Accounts and Other Receivables, Net - Schedule of Accounts Notes Loans and Financing Receivable (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Receivables [Abstract]    
Accrued insurance recoveries $ 233 $ 266
Other receivables 90 34
Total 15,681 12,440
CompX    
Receivables [Abstract]    
Trade receivables 15,428 12,210
Allowance for doubtful accounts $ (70) $ (70)