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Fair Value Measurements and Financial Instruments - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) NOK / $ NOK / € CAD / $ | Sep. 30, 2015 USD ($) NOK / $ NOK / € CAD / $ | Sep. 30, 2015 EUR (€) NOK / $ NOK / € CAD / $ | Sep. 30, 2015 CAD NOK / $ NOK / € CAD / $ | Dec. 31, 2014 USD ($)
Financial Instrument At Fair Value [Line Items] |  |  |  |  |
Estimated fair value of currency forward contracts | $ (2,700,000) | $ (2,700,000) |  |  | $ (4,200,000)
Fair value of interest rate swap contract, current and noncurrent | 5,700,000 | 5,700,000 |  |  |
Marketable securities | 256,000,000 | 256,000,000 |  |  | 255,600,000
Interest Rate Swap |  |  |  |  |
Financial Instrument At Fair Value [Line Items] |  |  |  |  |
Fair value of interest rate swap contract, current | 3,500,000 | 3,500,000 |  |  |
Fair value of interest rate swap contract, noncurrent | 2,200,000 | 2,200,000 |  |  |
Kronos Worldwide, Inc. | 2014 Term Loan |  |  |  |  |
Financial Instrument At Fair Value [Line Items] |  |  |  |  |
Estimated market price of the notes | 998.75 | 998.75 |  |  | 983.1
Principal amount of debt instrument | 1,000 | 1,000 |  |  | 1,000
Kronos Worldwide, Inc. | Interest Rate Swap | LIBOR |  |  |  |  |
Financial Instrument At Fair Value [Line Items] |  |  |  |  |
Notional amount currency forward contract | $ 344,750,000 | $ 344,750,000 |  |  |
Derivative, type of instrument |  | pay- fixed/receive-variable interest rate swap |  |  |
Interest rate swap, type of interest rate |  | fixed |  |  |
Interest rate swap, fixed rate | 2.016% | 2.016% | 2.016% | 2.016% |
Interest rate swap, floor rate | 1.00% | 1.00% | 1.00% | 1.00% |
Interest rate swap, inception date |  | Aug. 07, 2015 |  |  |
Interest rate swap, effective date |  | Sep. 30, 2015 |  |  |
Interest rate swap, notional amount decline each quarter |  | $ 875,000 |  |  |
Interest rate swap, notional amount decline commencing date |  | Dec. 31, 2015 |  |  |
Interest rate swap, final maturity date |  | Feb. 29, 2020 |  |  |
Interest rate swap, gains or losses representing hedge ineffectiveness |  | $ 0 |  |  |
Pretax loss amount recognized in other comprehensive income (loss) related to interest rate swap contract |  | 5,700,000 |  |  |
Reclassified from accumulated other comprehensive income (loss) in to earnings |  | 0 |  |  |
Accumulated other comprehensive income expected to be reclassified to earnings in next twelve months | $ 3,500,000 | 3,500,000 |  |  |
Fair value of interest rate swap contract, current and noncurrent | 5,700,000 | 5,700,000 |  |  |
Kronos Worldwide, Inc. | Interest Rate Swap | LIBOR | Accounts Payable and Accrued Liabilities |  |  |  |  |
Financial Instrument At Fair Value [Line Items] |  |  |  |  |
Fair value of interest rate swap contract, current | 3,500,000 | 3,500,000 |  |  |
Kronos Worldwide, Inc. | Interest Rate Swap | LIBOR | Other Noncurrent Liabilities |  |  |  |  |
Financial Instrument At Fair Value [Line Items] |  |  |  |  |
Fair value of interest rate swap contract, noncurrent | 2,200,000 | 2,200,000 |  |  |
Amalgamated Sugar Company LLC |  |  |  |  |
Financial Instrument At Fair Value [Line Items] |  |  |  |  |
Marketable securities | 250,000,000 | 250,000,000 |  |  | $ 250,000,000
Chemicals | Forward Contracts |  |  |  |  |
Financial Instrument At Fair Value [Line Items] |  |  |  |  |
Estimated fair value of currency forward contracts | (2,700,000) | (2,700,000) |  |  |
Currency transaction loss | (2,700,000) |  |  |  |
Chemicals | Norwegian Kroner | Forward Contracts |  |  |  |  |
Financial Instrument At Fair Value [Line Items] |  |  |  |  |
Notional amount currency forward contract | 8,100,000 | 8,100,000 |  |  |
Maturity rate of derivative | $ 2,700,000 | $ 2,700,000 |  |  |
Chemicals | Norwegian Kroner | Forward Contracts | Euro |  |  |  |  |
Financial Instrument At Fair Value [Line Items] |  |  |  |  |
Notional amount currency forward contract | € |  |  | € 5,000,000 |  |
Exchange rate | NOK / € | 8.56 | 8.56 | 8.56 | 8.56 |
Chemicals | Canadian |  |  |  |  |
Financial Instrument At Fair Value [Line Items] |  |  |  |  |
Notional amount currency forward contract | CAD |  |  |  | CAD 25,600,000 |
Exchange rate | CAD / $ | 1.29 | 1.29 | 1.29 | 1.29 |
Maturity rate of derivative | CAD |  |  |  | CAD 2,600,000 |
Minimum | Chemicals | Norwegian Kroner | Forward Contracts |  |  |  |  |
Financial Instrument At Fair Value [Line Items] |  |  |  |  |
Exchange rate | NOK / $ | 7.10 | 7.10 | 7.10 | 7.10 |
Maximum | Chemicals | Norwegian Kroner | Forward Contracts |  |  |  |  |
Financial Instrument At Fair Value [Line Items] |  |  |  |  |
Exchange rate | NOK / $ | 7.11 | 7.11 | 7.11 | 7.11 |

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- Definition Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26626-111562 + Details
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