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Schedule II - Condensed Financial Information of Registrant - General - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Feb. 28, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Feb. 28, 2022
Statutory Accounting Practices [Line Items]
Capital Contributions - UPCIC		$ 92,000,000	$ 114,000	$ 0
Subordinated surplus debenture		20,000,000
Received distributions from the earnings of subsidiaries		149,900,000	151,000,000	121,300,000
Subsequent Event
Statutory Accounting Practices [Line Items]
Subordinated surplus debenture					$ 90,000,000
UPCIC (1) (2)
Statutory Accounting Practices [Line Items]
Capital Contributions - UPCIC	$ 77,000,000	92,000,000	114,000,000	0
Dividend paid to immediate parent company		0	0	$ 0
UPCIC (1) (2) | Subsequent Event
Statutory Accounting Practices [Line Items]
Subordinated surplus debenture					$ 90,000,000
APPCIC
Statutory Accounting Practices [Line Items]
Dividend paid to immediate parent company		$ 0	$ 0

X

- Definition

This element represents disclosure of the aggregate cash dividends paid to the entity by consolidated subsidiaries.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(b))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690

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Period Type:	duration

X

- Definition

The cash inflow from an entity that is affiliated with the entity by means of direct or indirect ownership.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585

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X

- Definition

The cash inflow from parent as a source of financing that is recorded as additional paid in capital.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Debt obligation to borrow funds to provide itself with surplus funds. Subordinated debt places a lender in a lien position behind the primary lender of the company.

+ References

No definition available.

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