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