Amount of unrealized and realized gain (loss) on investment in debt and equity securities.

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-Topic 220
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Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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-SubTopic 10
-Section 50
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-Subparagraph (a)
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The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 3
-Subparagraph (c)
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The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

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- Definition

Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on securities.

+ References

No definition available.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

+ References

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-SubTopic 10
-Section 45
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The cash inflow from the sale of land held for investment; excludes sales of land held as inventory or productive use.

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Disclosure Other Income Net Additional Information Detail [Line Items]

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Gain (loss) on insurance settlement.

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Other Income, Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended						12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure Other Income Net Additional Information Detail [Line Items]
Dividends and interest income							$ 4,000	$ 4,800	$ 10,900
Gain on securities transaction recognized								(100)	300
Insurance recoveries							100	1,600	7,700
Pre-tax gain on sale of land	$ 10,400	$ 5,600					16,000	500	4,400
Net proceeds	$ 15,000	$ 8,400					$ 23,400		4,600
Gain on sale of business								$ 4,900	3,000
Kronos Worldwide, Inc.
Disclosure Other Income Net Additional Information Detail [Line Items]
Gains on insurance settlement related to property damage claim				$ 1,500	$ 2,600
NL
Disclosure Other Income Net Additional Information Detail [Line Items]
Insurance recoveries									$ 5,100
Pre-tax gain on sale of land						$ 4,400
Net proceeds						$ 4,600
NL \| Insurance and Risk Management Business
Disclosure Other Income Net Additional Information Detail [Line Items]
Proceeds from sale of business					3,250
Gain on sale of business					$ 3,000
BMI
Disclosure Other Income Net Additional Information Detail [Line Items]
Pre-tax gain on sale of land			$ 4,000