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Insurance Operations - Statutory Capital and Surplus, and an Amount Representing Ten Percent of Total Liabilities for both UPCIC and APPCIC (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 28, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Oct. 27, 2021	Dec. 31, 2020
Statutory Accounting Practices [Line Items]
Capital contributions - UPCIC		$ 15,000	$ 44,000	$ 92,000	$ 74,000
Subsequent Event
Statutory Accounting Practices [Line Items]
Subordinated surplus debenture						$ 20,000
UPCIC
Statutory Accounting Practices [Line Items]
Statutory capital and surplus		363,465		363,465			$ 360,707
Ten percent of total liabilities		129,593		129,593			98,682
Capital contributions - UPCIC	$ 77,000
APPCIC
Statutory Accounting Practices [Line Items]
Statutory capital and surplus		16,417		16,417			12,918
Ten percent of total liabilities		$ 7,365		$ 7,365			$ 1,793

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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+ References

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- Definition

The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(c))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529

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- Definition

The ten percent of statutory liabilities as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country.

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