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Long-Term Debt - Kronos Term Loan - Additional Information (Detail) - Kronos Worldwide, Inc. - USD ($) |  |  | 6 Months Ended
--- | --- | --- | ---
May. 21, 2015 | Feb. 18, 2014 | Jun. 30, 2015
2014 Term Loan, Amended 2015 |  |  |
Debt Instrument [Line Items] |  |  |
Loans maturity period | Feb. 28, 2020 |  |
2014 Term Loan, Amended 2015 | Notes Payable, Other Payables |  |  |
Debt Instrument [Line Items] |  |  |
Call premium percentage | 1.00% |  |
Refinancing fee | $ 750,000 |  |
Debt instrument, average interest rate during period |  |  | 4.00%
Debt instrument, Interest rate at period end |  |  | 4.58%
Unamortized discount balance |  |  | $ 1,300,000
Quarterly aggregate principal repayments |  |  | $ 1,800,000
2014 Term Loan, Amended 2015 | LIBOR | Notes Payable, Other Payables |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument basis spread on variable rate | 3.00% |  |
2014 Term Loan, Amended 2015 | Base Rate | Notes Payable, Other Payables |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument basis spread on variable rate | 2.00% |  |
2014 Term Loan | LIBOR | Notes Payable, Other Payables |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument basis spread on variable rate |  | 3.75% |
2014 Term Loan | Base Rate | Notes Payable, Other Payables |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument basis spread on variable rate |  | 2.75% |

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