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

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=26873400&loc=d3e24072-122690

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Period Type:	duration

- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

The distributions of earnings to an entity that is affiliated with the reporting 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 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

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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.

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- Definition

Statutory Accounting Practices, Statutory Capital and Surplus, Capital Contribution

+ References

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Schedule II - Condensed Financial Information of Registrant - General - Additional Information (Detail) - USD ($)		3 Months Ended												12 Months Ended
	Feb. 11, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statutory Accounting Practices [Line Items]
Capital contributions to subsidiaries														$ 0	$ 0	$ 0
Cash dividend declared per common share (in dollars per share)		$ 0.29	$ 0.16	$ 0.16	$ 0.16	$ 0.29	$ 0.16	$ 0.14	$ 0.14	$ 0.27	$ 0.14	$ 0.14	$ 0.14	$ 0.77	$ 0.73	$ 0.69
UPCIC [Member]
Statutory Accounting Practices [Line Items]
Dividend paid to immediate parent company														$ 0	$ 0	$ 30,000,000.0
Statutory capital contribution		$ 30,000,000.0												30,000,000.0
APPCIC [Member]
Statutory Accounting Practices [Line Items]
Dividend paid to immediate parent company														$ 0	$ 0	$ 0
Subsequent Event [Member]
Statutory Accounting Practices [Line Items]
Cash dividend declared per common share (in dollars per share)	$ 0.16