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Summary of significant accounting policies - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Total number of weeks in a fiscal year | 52 | 52 | 52
Advertising costs | $ 372,000 | $ 386,000 | $ 319,000
Depreciation expense on property plant and equipment | 3,100,000 | 3,500,000 | 3,900,000
Defined contribution plan expense | 1,800,000 | 1,700,000 | 1,500,000
Undistributed earnings of foreign subsidiaries | 0 | 0 |
Uncertain tax positions reserve | 0 | 0 |
Weighted average number of outstanding stock options excluded from calculation of diluted earnings per share | 0 | 9,200 | 27,000
NL [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Percentage of ownership held by parent company | 87.00% |  |
Income tax payments to NL | $ 1,200,000 | $ 3,700,000 | $ 2,200,000
Valhi [Member] | NL [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Percentage of ownership held by parent company | 83.00% |  |
Contran Corporation [Member] | Valhi [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Percentage of ownership held by parent company | 93.00% |  |
Buildings [Member] | Minimum [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment, estimated useful lives | 15 years |  |
Buildings [Member] | Maximum [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment, estimated useful lives | 40 years |  |
Equipment and software [Member] | Minimum [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment, estimated useful lives | 3 years |  |
Equipment and software [Member] | Maximum [Member] |  |  |
Schedule Of Significant Accounting Policies [Line Items] |  |  |
Property and equipment, estimated useful lives | 20 years |  |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition 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 Emerging Issues Task Force (EITF) -Number 07-4 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 171 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -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 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 13, 14 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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