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Long-Term Debt - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Notes Payable, Other Payables [Member]
 
Debt Instrument [Line Items]  
Borrowing under credit facility 40
CompX [Member]
 
Debt Instrument [Line Items]  
Average interest rate of promissory note 1.30%