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Long-Term Debt - Kronos Term Loan - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 7 Months Ended 1 Months Ended 3 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Sep. 30, 2012
Jul. 30, 2013
Kronos Worldwide, Inc.
Term Loan
Jul. 31, 2013
Kronos Worldwide, Inc.
Term Loan
Principal Prepayment
Feb. 28, 2013
Kronos Worldwide, Inc.
Term Loan
Principal Prepayment
Sep. 30, 2013
Kronos Worldwide, Inc.
Term Loan
Principal Prepayment
Debt Instrument [Line Items]              
Payment of Principal Amount         $ 100 $ 290  
Pre Tax Interest Charge (2.3) (8.9) (7.2)     6.6 2.3
Cash used for payment of term loan         50 100  
Borrowing from Contran for prepayment of term loan           $ 190  
Percentage of average interest rate, during period       6.80%