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Accounts and Other Receivables, Net - Schedule of Accounts Notes Loans and Financing Receivable (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Receivables [Abstract] |  |
Other receivables | $ 15 | $ 393
Accrued insurance recoveries | 15 | 18
Total | 16,672 | 11,142
CompX |  |
Receivables [Abstract] |  |
Trade receivables | 16,712 | 10,801
Allowance for doubtful accounts | $ (70) | $ (70)

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