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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Significant Accounting Policies [Line Items]      
Depreciation expense $ 3,600,000 $ 3,600,000 $ 3,300,000
Net income tax payments $ 611,000 193,000 302,000
Uncertain tax positions 50.00%    
Advertising costs $ 0 0 0
Research, development and certain sales technical support costs $ 0 0 0
Minimum | Building      
Significant Accounting Policies [Line Items]      
Property and equipment, estimated useful lives 15 years    
Minimum | Equipment and Software      
Significant Accounting Policies [Line Items]      
Property and equipment, estimated useful lives 3 years    
Maximum | Building      
Significant Accounting Policies [Line Items]      
Property and equipment, estimated useful lives 40 years    
Maximum | Equipment and Software      
Significant Accounting Policies [Line Items]      
Property and equipment, estimated useful lives 20 years    
Kronos      
Significant Accounting Policies [Line Items]      
Parent company ownership interest 30.00%    
Valhi Inc      
Significant Accounting Policies [Line Items]      
Parent company ownership interest 83.00%    
Net income tax refunds   $ 100,000  
Net income tax payments $ 600,000   $ 300,000
Contran Corporation      
Significant Accounting Policies [Line Items]      
Parent company ownership interest 93.00%    
CompX      
Significant Accounting Policies [Line Items]      
Percentage of controlling interest owned 13.00%