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Accounts and Other Receivables, Net - Schedule of Accounts Notes Loans and Financing Receivable (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Receivables [Abstract]    
Accrued insurance recoveries $ 15,427 $ 145
Other receivables 96 79
Total 28,869 10,670
CompX    
Receivables [Abstract]    
Trade receivables 13,416 10,516
Allowance for doubtful accounts $ (70) $ (70)