Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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The average effective interest rate during the reporting period.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount of the required periodic payments applied to principal.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Expenses paid for obtaining loans which includes expenses such as application and origination fees.

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No definition available.

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Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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Disclosure of timing of required repayments, sinking fund requirements, and other redeemable securities at fixed or determinable prices and dates in the five years immediately following the date of the latest balance sheet presented in the financial statements, and the amount thereafter to fully repay the principal of long-term debt. These disclosures may be made either on an individual debt or security basis, by type of debt or security basis, or on a combined basis.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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No definition available.

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The cash inflow from a long-term borrowing made from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Proceeds from Advances from Affiliates.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Debt instrument call premium percentage.

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No definition available.

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Debt covenant limitation on the amount of default under any indebtedness.

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No definition available.

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Percentage of principal amount of debt issued.

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No definition available.

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Any principal prepayments before this date will require the payment of a call premium, and principal prepayments after this date will not require the payment of a call premium.

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Debt instrument principal repayment commencing date.

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Minimum percentage of LIBOR.

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No definition available.

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The percentage of common stock or other ownership interest in subsidiary pledged as collateral under a debt instrument.

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No definition available.

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Repayments of long term debt from cash on hand.

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Long-Term Debt - Kronos Term Loan - Additional Information (Detail) - USD ($)		1 Months Ended		3 Months Ended	12 Months Ended
	Feb. 18, 2014	May. 31, 2015	Feb. 28, 2014	Sep. 30, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Repayment of credit facility					$ 53,400,000	$ 343,100,000	$ 693,300,000
Loss on prepayment of debt, net							(8,900,000)
Kronos Worldwide, Inc. \| 2014 Term Loan
Debt Instrument [Line Items]
Loans maturity period		Feb. 28, 2020
Kronos Worldwide, Inc. \| Notes Payable, Other Payables \| Contran
Debt Instrument [Line Items]
Repayment of credit facility			$ 170,000,000
Kronos Worldwide, Inc. \| Notes Payable, Other Payables \| 2012 Term Loan
Debt Instrument [Line Items]
Repayment of credit facility							390,000,000
Principal amount of promissory note							400,000,000	$ 400,000,000
Loss on prepayment of debt, net							8,900,000
Repayments of long term debt from cash on hand				$ 50,000,000			150,000,000
Borrowing from Contran for prepayment of term loan							190,000,000
Borrowings for prepayment of term loan							$ 50,000,000
Kronos Worldwide, Inc. \| Notes Payable, Other Payables \| 2014 Term Loan \| Libor Rate
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate	3.75%		3.75%
Kronos Worldwide, Inc. \| Notes Payable, Other Payables \| 2014 Term Loan \| Base Rate
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate	2.75%		2.75%
Kronos Worldwide, Inc. \| Notes Payable, Other Payables \| 2014 Term Loan
Debt Instrument [Line Items]
Principal amount of promissory note			$ 350,000,000
Borrowings for prepayment of term loan			$ 348,300,000
Percentage of loan issued to principal amount			99.50%
Quarterly principal repayments			$ 875,000
Quarterly principal repayments, commencing date			Jun. 30, 2014
Loans maturity period			Feb. 28, 2020
Long term debt prepayments terms					Voluntary principal prepayments are permitted at any time.
Minimum amount of debt default for using customary default provisions					$ 50,000,000
Call premium percentage		1.00%
Voluntary prepayment, earliest date		Nov. 30, 2015
Refinancing fee		$ 750,000
Debt instrument, average interest rate during period					4.29%
Debt instrument, Effective interest rate at period end					4.00%
Unamortized discount balance					$ 1,200,000	1,500,000
Debt Issuance Cost					$ 4,700,000	$ 5,000,000
Kronos Worldwide, Inc. \| Notes Payable, Other Payables \| 2014 Term Loan \| Unsecured Promissory Note Issued by Kronos International, Inc.
Debt Instrument [Line Items]
Loan pledged as collateral from wholly-owned subsidiary			$ 395,700,000
Kronos Worldwide, Inc. \| Notes Payable, Other Payables \| 2014 Term Loan \| U.S. wholly-owned subsidiaries
Debt Instrument [Line Items]
Term Loan Collateralized Priority			100.00%
Kronos Worldwide, Inc. \| Notes Payable, Other Payables \| 2014 Term Loan \| Canadian first-tier European subsidiaries
Debt Instrument [Line Items]
Term Loan Collateralized Priority			65.00%
Kronos Worldwide, Inc. \| Notes Payable, Other Payables \| 2014 Term Loan \| Libor Rate
Debt Instrument [Line Items]
Minimum LIBOR rate			1.00%
Debt instrument basis spread on variable rate		3.00%
Kronos Worldwide, Inc. \| Notes Payable, Other Payables \| 2014 Term Loan \| Base Rate
Debt Instrument [Line Items]
Debt instrument basis spread on variable rate		2.00%