Business Segment Information - Additional Information (Detail) $ in Millions	3 Months Ended
Mar. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Contract related intangible asset impairment	$ 5.1
Business interruption insurance proceeds	2.0
Real Estate Management And Development
Segment Reporting Information [Line Items]
Contract related intangible asset impairment	5.1
Chemicals
Segment Reporting Information [Line Items]
Business interruption insurance proceeds	$ 2.0
Kronos Worldwide, Inc.
Segment Reporting Information [Line Items]
Direct controlling interest in subsidiary	50.00%
Indirect controlling interest in subsidiary	30.00%
NL
Segment Reporting Information [Line Items]
Total controlling interest	83.00%
LandWell
Segment Reporting Information [Line Items]
Direct controlling interest in subsidiary	27.00%
Indirect controlling interest in subsidiary	50.00%
BMI
Segment Reporting Information [Line Items]
Total controlling interest	63.00%

The net amount (to the extent disclosed within this portion of the income statement) by which an insurance settlement exceeds incremental costs incurred from the event causing an interruption of business, plus the insurance award for earnings lost from the event, such as a natural catastrophe, explosion or fire.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6365675&loc=d3e16285-107787

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275

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