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Organization and basis of presentation - Additional Information (Detail) (USD $)	3 Months Ended
	Jun. 30, 2013
NL [Member]
Schedule Of Significant Accounting Policies [Line Items]
Percentage of ownership held by parent company	87.00%
NL [Member] | Valhi Inc [Member]
Schedule Of Significant Accounting Policies [Line Items]
Percentage of ownership held by parent company	83.00%
Contran Corporation [Member] | Valhi Inc [Member]
Schedule Of Significant Accounting Policies [Line Items]
Percentage of ownership held by parent company	93.00%
Maximum [Member]
Schedule Of Significant Accounting Policies [Line Items]
Common Stock Dividend declared by directors	$ 0.125
Minimum [Member]
Schedule Of Significant Accounting Policies [Line Items]
Common Stock Dividend declared by directors	$ 0.050

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

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- Definition

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

+ References

No definition available.

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