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Schedule II - Condensed Financial Information of Registrant - General - Additional Information (Detail) - USD ($)		3 Months Ended												12 Months Ended
	Jan. 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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statutory Accounting Practices [Line Items]
Cash dividend declared per common share (in dollars per share)		$ 0.29	$ 0.16	$ 0.14	$ 0.14	$ 0.27	$ 0.14	$ 0.14	$ 0.14	$ 0.27	$ 0.14	$ 0.14	$ 0.14	$ 0.73	$ 0.69	$ 0.69
Capital contributions to subsidiaries														$ 0	$ 0
UPCIC
Statutory Accounting Practices [Line Items]
Dividend paid to immediate parent company														0	30,000,000.0	$ 0
APPCIC
Statutory Accounting Practices [Line Items]
Dividend paid to immediate parent company														0	0
Capital contributions to subsidiaries														$ 0	$ 0	$ 2,000,000.0
Subsequent Event
Statutory Accounting Practices [Line Items]
Cash dividend declared per common share (in dollars per share)	$ 0.16

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=26873400&loc=d3e24072-122690

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- 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

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+ 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=109223946&loc=d3e3291-108585

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- Definition

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+ References

No definition available.

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