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Long-term debt - CompX - Additional Information (Detail) (CompX [Member], USD $)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2011
Line of Credit [Member]
Jul. 31, 2011
Line of Credit [Member]
Dec. 31, 2010
Line of Credit [Member]
Dec. 31, 2012
Line of Credit [Member]
Jan. 31, 2012
Availability Before Amendment [Member]
Line of Credit [Member]
Jan. 31, 2012
Availability After Amendment [Member]
Line of Credit [Member]
Dec. 31, 2012
Availability After Amendment [Member]
Line of Credit [Member]
Line of Credit Facility [Line Items]                
Reduce size of credit facility         $ 37.5 $ 37.5 $ 30.0  
Credit facility extend maturity date           Jan. 31, 2012 Jan. 31, 2015  
Credit facility collateralized ownership percentage               65.00%
Borrowings     5.3 3.0        
Repayment of borrowings   2.9            
Average interest rate on revolving bank credit facility   4.40%            
Amount outstanding $ 2.0 $ 2.0