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Related Party Transactions - Additional Information (Detail) - USD ($) shares in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2011
Contran | Intercorporate Services Agreements Fees |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction |  | $ 36,500,000 | $ 35,800,000 | $ 33,400,000 |
Contran | Intercorporate Services Agreements Fees | Scenario, Forecast |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction | $ 34,500,000 |  |  |  |
Contran | Combined Information Technology Data Recovery Program |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction |  | 253,000 | 298,000 | 243,000 |
Contran | Pledge Fee Received |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Revenue and other income from related party transactions |  | 1,200,000 | $ 800,000 | 900,000 |
Contran | Tremont | Deferred Payment | Present Value |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Guarantee Obligations, estimated exposure |  | 9,000,000 |  |  |
Contran | Tremont | Deferred Payment | Face Value |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Guarantee Obligations, estimated exposure |  | 11,100,000 |  |  |
Contran | Tremont | Promissory Notes |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Guarantee Obligations, estimated exposure |  | $ 14,500,000 |  |  |
Contran | Kronos Worldwide, Inc. | Securities Pledged as Collateral |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Stock pledged as collateral |  | 30.2 | 31.2 |  |
Contran | WCS | Surety Bond |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Guarantee Obligations, maximum exposure |  |  |  |  | $ 88,800,000
Contran | WCS | Performance Guarantee |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Guarantee Obligations, estimated exposure |  | $ 3,900,000 | $ 3,900,000 | 3,900,000 |
Contran | Revolving Credit Facility |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Interest on borrowings under credit facilities |  | 12,900,000 | 10,300,000 | 11,000,000 |
Contran | Letter Of Credit | WCS |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Guarantee Obligations, maximum exposure |  | 6,200,000 |  |  |
Costs related to the Letter of Credit |  | 100,000 | 100,000 | 100,000 |
Contran and Other Affiliates |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party transaction cash received for insurance premium |  | 5,300,000 | 5,400,000 | 5,700,000 |
LPC |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Purchase of Ti02 from LPC |  | 157,900,000 | 176,500,000 | 193,100,000 |
Sales of feedstock ore to LPC |  | $ 68,800,000 | $ 80,600,000 | $ 98,400,000 |

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