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Fair Value Measurements and Financial Instruments - Additional Information (Detail) |  | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Aug. 07, 2015 USD ($) | Jun. 30, 2015 USD ($) NOK / $ NOK / € | Jul. 31, 2015 CAD CAD / $ | Jun. 30, 2015 EUR (€) NOK / $ NOK / € | Dec. 31, 2014 USD ($)
Financial Instrument At Fair Value [Line Items] |  |  |  |  |
Estimated fair value of currency forward contracts |  | $ (2,000,000) |  |  | $ (4,200,000)
Marketable securities |  | 256,200,000 |  |  | 255,600,000
Kronos Worldwide, Inc. | 2014 Term Loan |  |  |  |  |
Financial Instrument At Fair Value [Line Items] |  |  |  |  |
Estimated market price of the notes |  | 1,000 |  |  | 983.1
Principal amount of debt instrument |  | 1,000 |  |  | 1,000
Amalgamated Sugar Company LLC |  |  |  |  |
Financial Instrument At Fair Value [Line Items] |  |  |  |  |
Marketable securities |  | 250,000,000 |  |  | $ 250,000,000
Subsequent Event | Kronos Worldwide, Inc. | Interest Rate Swap | LIBOR |  |  |  |  |
Financial Instrument At Fair Value [Line Items] |  |  |  |  |
Notional amount currency forward contract | $ 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% |  |  |  |
Interest rate swap, floor rate | 1.00% |  |  |  |
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 |  |  |  |
Chemicals | Forward Contracts |  |  |  |  |
Financial Instrument At Fair Value [Line Items] |  |  |  |  |
Estimated fair value of currency forward contracts |  | (2,000,000) |  |  |
Currency transaction loss |  | (2,000,000) |  |  |
Chemicals | Norwegian Kroner | Forward Contracts |  |  |  |  |
Financial Instrument At Fair Value [Line Items] |  |  |  |  |
Notional amount currency forward contract |  | 16,200,000 |  |  |
Maturity rate of derivative |  | $ 2,700,000 |  |  |
Chemicals | Norwegian Kroner | Forward Contracts | Euro |  |  |  |  |
Financial Instrument At Fair Value [Line Items] |  |  |  |  |
Notional amount currency forward contract | € |  |  |  | € 10,000,000 |
Maturity rate of derivative | € |  |  |  | € 5,000,000 |
Chemicals | Canadian | Subsequent Event |  |  |  |  |
Financial Instrument At Fair Value [Line Items] |  |  |  |  |
Notional amount currency forward contract | CAD |  |  | CAD 30,700,000 |  |
Exchange rate | CAD / $ |  |  | 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 / $ |  | 7.09 |  | 7.09 |
Minimum | Chemicals | Norwegian Kroner | Forward Contracts | Euro |  |  |  |  |
Financial Instrument At Fair Value [Line Items] |  |  |  |  |
Exchange rate | NOK / € |  | 8.53 |  | 8.53 |
Maximum | Chemicals | Norwegian Kroner | Forward Contracts |  |  |  |  |
Financial Instrument At Fair Value [Line Items] |  |  |  |  |
Exchange rate | NOK / $ |  | 7.11 |  | 7.11 |
Maximum | Chemicals | Norwegian Kroner | Forward Contracts | Euro |  |  |  |  |
Financial Instrument At Fair Value [Line Items] |  |  |  |  |
Exchange rate | NOK / € |  | 8.56 |  | 8.56 |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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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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