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Exit of Property and Casualty Insurance Business - (Narrative) (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disposal Group Not Discontinued Operation Disposal Disclosures [Abstract]
Impairment losses on exit of business	$ 0		$ 73,264	$ 0	$ 73,264
Revenues	24,300		35,300	103,000	101,300
Gain on disposition of business		$ 12,200
Income (loss) before income taxes	$ 10,500		$ 75,700	$ 11,100	$ 91,500

X

- Definition

Definition: Amount of pretax income (loss) attributable to disposal group that is not classified as a discontinued operation.

+ References

No definition available.

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- Definition

Amount of revenue attributable to disposal group that is not classified as a discontinued operation.

+ References

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- Definition

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)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1B
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684

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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

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-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
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