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Long-Term Debt - Additional Information (Detail) - USD ($) shares in Millions | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 30, 2016 | Dec. 31, 2016 | Nov. 14, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jan. 30, 2010
Valhi Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Outstanding borrowing |  | $ 500,000 |  |  |  |
Debt instrument average interest rate |  | 5.63% |  |  |  |
Debt instrument average interest rate, during period |  | 5.46% |  |  |  |
Valhi | Unsecured Revolving Promissory Note |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing under credit facility | $ 40,000,000 |  |  |  |  | $ 40,000,000
Outstanding borrowing |  | $ 0 |  | $ 0 | $ 0 |
Transaction date |  | Nov. 30, 2016 |  |  |  |
NLKW Holding, LLC | Kronos |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Asset contribution, equity security shares | 35.2 |  |  |  |  |
NLKW Holding, LLC | Valhi Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Outstanding borrowing |  | $ 500,000 |  |  |  |
NLKW Holding, LLC | Back-To-Back Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing under credit facility | $ 50,000,000 |  |  |  |  |
Percentage of membership interest in subsidiary | 100.00% |  |  |  |  |
NLKW Holding, LLC | Valhi | Valhi Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing under credit facility | $ 50,000,000 |  | $ 50,000,000 |  |  |
Variable rate basis spread above reference rate | 1.875% |  |  |  |  |
Line of credit facility frequency of payment of interest |  | quarterly |  |  |  |
Line of credit facility expiration date |  | Dec. 31, 2023 |  |  |  |
Maximum principle outstanding, percentage of collateral value | 50.00% |  |  |  |  |
Debt instrument collateral |  | 100% of the membership interest in NLKW held by us |  |  |  |
Percentage of membership interest in subsidiary | 100.00% |  |  |  |  |
NLKW Holding, LLC | Valhi | Stock Repurchase Rights [Member] | Valhi Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Variable rate basis spread above reference rate | 2.75% |  |  |  |  |
Stock repurchase, maximum debt percentage | 50.00% |  |  |  |  |
Debt instrument maturity period |  | 5 years |  |  |  |

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- Definition Discussion of whether the debt instrument is secured or unsecured, and, if secured, a description of the collateral and guarantees required or provided. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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