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Accounts and Other Receivables, Net - Schedule of Accounts Notes Loans and Financing Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Receivables [Abstract]    
Trade receivables-CompX $ 9,744 $ 8,696
Promissory note receivable 1,206 3,034
Accrued insurance recoveries 847 476
Affiliate receivables-taxes 881  
Other receivables 64 51
Refundable income taxes 4 8
Allowance for doubtful accounts (216) (216)
Total $ 12,530 $ 12,049