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Accounts and Other Receivables, Net - Schedule of Accounts Notes Loans and Financing Receivable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Receivables [Abstract]    
Accrued insurance recoveries $ 145 $ 104
Other receivables 79 121
Total 10,670 10,572
CompX    
Receivables [Abstract]    
Trade receivables 10,516 10,417
Allowance for doubtful accounts $ (70) $ (70)