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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 | 12 Months Ended
--- | --- | ---
Feb. 26, 2021 | Dec. 31, 2020 | Feb. 29, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statutory Accounting Practices [Line Items] |  |  |  |  |  |
Capital Contributions - UPCIC |  |  |  | $ 114,000 | $ 0 | $ 0
UPCIC [Member] |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |
Statutory capital and surplus |  | $ 360,707 |  | 360,707 | 301,120 |
Ten percent of total liabilities |  | 98,682 |  | 98,682 | 99,228 |
Capital Contributions - UPCIC |  | 114,000 | $ 30,000 |  |  |
UPCIC [Member] | Subsequent Event [Member] |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |
Capital Contributions - UPCIC | $ 77,000 |  |  |  |  |
APPCIC [Member] |  |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |  |
Statutory capital and surplus |  | 12,918 |  | 12,918 | 16,433 |
Ten percent of total liabilities |  | $ 1,793 |  | $ 1,793 | $ 621 |

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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 + Details
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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. + References No definition available. + Details
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