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Related Party Transactions - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Feb. 28, 2010
NL Industries            
Related Party Transaction [Line Items]            
Loans outstanding amount       $ 0    
Contran Corporation | Intercorporate Services Agreements Fees            
Related Party Transaction [Line Items]            
Related party transaction expense   $ 3,000,000 $ 3,000,000 3,900,000    
Contran Corporation | Intercorporate Services Agreements Fees | Scenario Forecast            
Related Party Transaction [Line Items]            
Related party transaction expense $ 3,100,000          
Tall Pines Insurance Company And EWI RE Inc            
Related Party Transaction [Line Items]            
Related party transaction expense   $ 1,600,000 $ 1,100,000 1,000,000    
Unsecured Revolving Demand Promissory | NL Industries            
Related Party Transaction [Line Items]            
Maximum loan amount           $ 40,000,000
Interest rate on loans repayment           0.75%
Promissory Note Payable | TIMET Finance Management Company            
Related Party Transaction [Line Items]            
Promissory note, Variable rate         1.00%  
Maturity period   2014-09        
Quarterly principal repayments         $ 250,000  
Repayments of principal amount       18,500,000    
Interest expense       $ 127,000