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Business Segment Information - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |
Contract related intangible asset impairment |  |  | $ 5.1
Business interruption insurance proceeds |  |  | 3.4
Long-lived asset impairment |  | $ 170.6 |
Real Estate Management And Development | Customer Relationships |  |  |
Segment Reporting Information [Line Items] |  |  |
Contract related intangible asset impairment | $ 5.1 |  | 5.1
Chemicals |  |  |
Segment Reporting Information [Line Items] |  |  |
Business interruption insurance proceeds |  |  | $ 3.4
Waste Management |  |  |
Segment Reporting Information [Line Items] |  |  |
Long-lived asset impairment |  | $ 170.6 |
Kronos Worldwide, Inc. |  |  |
Segment Reporting Information [Line Items] |  |  |
Direct ownership percentage by parent |  | 50.00% |
Indirect controlling interest in subsidiary |  | 30.00% |
NL |  |  |
Segment Reporting Information [Line Items] |  |  |
Direct ownership percentage by parent |  | 83.00% |
LandWell |  |  |
Segment Reporting Information [Line Items] |  |  |
Direct ownership percentage by parent |  | 27.00% |
Indirect controlling interest in subsidiary |  | 50.00% |
BMI |  |  |
Segment Reporting Information [Line Items] |  |  |
Direct ownership percentage by parent |  | 63.00% |
BMI | Real Estate Management And Development |  |  |
Segment Reporting Information [Line Items] |  |  |
Direct ownership percentage by parent |  | 63.00% |

X
- Definition 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. + References 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=64839914&loc=d3e16285-107787 + Details
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- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. + 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=66006027&loc=d3e16373-109275 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84241808&loc=d3e92212-112881 Reference 2: 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=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2921-110230 + Details
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