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Business and Geographic Segments - Additional Information (Detail) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) Segment | Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Number of operating segments | Segment |  |  |  | 3 |
Contract related intangible asset impairment |  |  | $ 5.1 |  | $ 5.1
Business interruption insurance proceeds | $ 0.9 | $ 1.4 | 2.0 |  | 4.3
Non-U.S. subsidiaries |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net assets of non-U.S. subsidiaries | $ 374.0 |  |  | $ 614.0 | 374.0
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 |  |  |  |  | $ 4.3
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% |

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