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Long-term debt - Kronos Term Loan - Additional Information (Detail)
 12 Months Ended 12 Months Ended 1 Months Ended 9 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
LIBOR Option [Member]
Dec. 31, 2012
Base Rate Option [Member]
Dec. 31, 2012
Kronos Worldwide, Inc. [Member]
USD ($)
Dec. 31, 2012
Kronos Worldwide, Inc. [Member]
Scenario, Forecast [Member]
USD ($)
Jun. 30, 2012
Kronos Worldwide, Inc. [Member]
6.5% Senior Secured Notes [Member]
EUR (€)
Dec. 31, 2012
Kronos Worldwide, Inc. [Member]
Term Loan Payable [Member]
USD ($)
Sep. 30, 2012
Kronos Worldwide, Inc. [Member]
Term Loan Payable [Member]
Dec. 31, 2012
Kronos Worldwide, Inc. [Member]
Term Loan Payable [Member]
USD ($)
Feb. 28, 2013
Kronos Worldwide, Inc. [Member]
Term Loan Payable [Member]
USD ($)
Dec. 31, 2012
Kronos Worldwide, Inc. [Member]
Term Loan Payable [Member]
Certain US Subsidiaries [Member]
Dec. 31, 2012
Kronos Worldwide, Inc. [Member]
Term Loan Payable [Member]
Canadian Subsidiary [Member]
Dec. 31, 2012
Kronos Worldwide, Inc. [Member]
New Loan [Member]
USD ($)
Debt Instrument [Line Items]                          
Principal amount of debt instrument             $ 400,000,000   $ 400,000,000        
Interest rate of Senior Secured Notes       6.50%                  
Principal amount outstanding           279,200,000              
Percentage of term loan issued             98.50%   98.50%        
Term Loan             394,000,000   394,000,000        
Additional term loan borrowings             100,000,000   100,000,000        
Minimum LIBOR rate for Kronos Option 1.00%                        
Variable rate for term loan   4.75% 3.75%                    
Average interest rate on revolving bank credit facility             5.75%   5.82%        
Principal repayments               5.0 Quarterly        
Principal repayments maturity date       Jun. 30, 2018         Jun. 30, 2018        
Collateralized loan on common stock                     100.00% 65.00%  
Additional collateral on Kronos Term Loan                 362,100,000        
Specified financial covenant (leverage to EBITDA)                 3.5        
Provision for other indebtedness             50,000,000   50,000,000        
Carrying amount of term loan includes unamortized original issue discount             5,500,000   5,500,000        
Prepayment of term loan                 290,000,000        
Prepayment of loan by cash                   100,000,000      
Borrowings                         190,000,000
Term loan       384,500,000           100,000,000      
Expected non cash pretax interest         $ 7,000,000