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Long-Term Debt - Kronos Term Loan - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 8 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Sep. 13, 2017 | Sep. 30, 2017
Debt Instrument [Line Items] |  |  |  |  |
Loss on prepayment of debt |  | $ 7.1 |  |  | $ 7.1
Kronos Worldwide, Inc. | Notes Payable, Other Payables | 2014 Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Quarterly principal payment |  |  | $ 1.8 |  |
Debt instrument, voluntary repayment period |  |  |  |  | 2017-09
Repayments of debt | $ 338.6 |  |  |  |
Loss on prepayment of debt |  | 7.1 |  |  |
Termination of interest rate swap contract |  | 3.3 |  |  |
Write-off of unamortized debt issuance costs |  | 2.7 |  |  |
Write-off of unamortized original issue discount |  | $ 0.7 |  |  |
Debt instrument, average interest rate during period |  |  |  | 4.10% |

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