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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

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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 + Details
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