The amount of cash paid during the current period to the parent company for taxes on income.

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Schedule of significant accounting policies.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6510752

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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The amount of the cost recognized during the period for defined contribution plans.

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-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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No definition available.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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No definition available.

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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Significant Accounting Policies [Line Items]
Depreciation	$ 3.5	$ 3.5	$ 3.2
Defined Contribution Plan, Cost Recognized	2.4	2.3	2.0
Income tax payments to NL	$ 4.7	$ 4.4	$ 14.1
Stock options outstanding	0	0	0
Minimum \| Building
Schedule Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	15 years
Minimum \| Equipment and software
Schedule Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	3 years
Maximum \| Building
Schedule Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	40 years
Maximum \| Equipment and software
Schedule Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	20 years
NL Industries
Schedule Of Significant Accounting Policies [Line Items]
Percentage of ownership held by parent company	87.00%
NL Industries \| Valhi Inc
Schedule Of Significant Accounting Policies [Line Items]
Percentage of ownership held by parent company	83.00%
Contran Corporation \| Valhi Inc
Schedule Of Significant Accounting Policies [Line Items]
Percentage of ownership held by parent company	93.00%