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Insurance Operations - Additional Information (Detail) - USD ($)		3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 01, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
UPCIC
Statutory Accounting Practices [Line Items]
Dividends			$ 0	$ 0
APPCIC
Statutory Accounting Practices [Line Items]
Dividends		$ 0			$ 0
UPCIC and APPCIC
Statutory Accounting Practices [Line Items]
Minimum capitalization rate	10.00%					10.00%
UPCIC and APPCIC | Minimum
Statutory Accounting Practices [Line Items]
Minimum capitalization amount	$ 15,000,000					$ 10,000,000

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- Definition

Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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-Topic 942
-SubTopic 405
-Section 45
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+ References

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- Definition

Amount of statutory capital required to be maintained as of the balance sheet date under prescribed or permitted statutory accounting practices.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 505
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- Definition

Represents the minimum amount of capitalization required by regulatory agencies as a percentage of total liabilities.

+ References

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