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Accounts and Other Receivables, Net - Schedule of Accounts Notes Loans and Financing Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Receivables [Abstract]    
Other receivables $ 152 $ 159
Refundable income taxes 14 8
Allowance for doubtful accounts (130) (128)
Total 12,310 10,632
Trade Receivables
   
Receivables [Abstract]    
Trade receivables - CompX 11,769 8,662
Accrued Insurance Recoveries
   
Receivables [Abstract]    
Accrued insurance recoveries 505 1,877
Valhi | Income Tax Receivable
   
Receivables [Abstract]    
Income taxes receivable from Valhi   $ 54